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<?php
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/**
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* @file
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* Code to compute the dates that match an iCal RRULE.
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*
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* Moved to a separate file since it is not used on most pages
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* so the code is not parsed unless needed.
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*
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* Extensive simpletests have been created to test the RRULE calculation
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* results against official examples from RFC 2445.
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*
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* These calculations are expensive and results should be stored or cached
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* so the calculation code is not called more often than necessary.
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*
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* Currently implemented:
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* INTERVAL, UNTIL, COUNT, EXDATE, RDATE, BYDAY, BYMONTHDAY, BYMONTH,
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* YEARLY, MONTHLY, WEEKLY, DAILY
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*
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* Currently not implemented:
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*
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* BYYEARDAY, MINUTELY, HOURLY, SECONDLY, BYMINUTE, BYHOUR, BYSECOND
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* These could be implemented in the future.
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*
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* BYSETPOS
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* Seldom used anywhere, so no reason to complicated the code.
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*/
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/**
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* Private implementation of date_repeat_calc().
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*
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* Compute dates that match the requested rule, within a specified date range.
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*/
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function _date_repeat_calc($rrule, $start, $end, $exceptions, $timezone, $additions) {
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module_load_include('inc', 'date_api', 'date_api_ical');
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if (empty($timezone)) {
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$timezone = date_default_timezone();
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}
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// Make sure the 'EXCEPTIONS' string isn't appended to the rule.
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$parts = explode("\n", $rrule);
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if (count($parts)) {
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$rrule = $parts[0];
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}
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// Get the parsed array of rule values.
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$rrule = date_ical_parse_rrule('RRULE:', $rrule);
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// These default values indicate there is no RRULE here.
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if ($rrule['FREQ'] == 'NONE' || (isset($rrule['INTERVAL']) && $rrule['INTERVAL'] == 0)) {
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return array();
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}
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// Create a date object for the start and end dates.
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$start_date = new DateObject($start, $timezone);
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// Versions of PHP greater than PHP 5.3.5 require that we set an explicit time when
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// using date_modify() or the time may not match the original value. Adding this
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// modifier gives us the same results in both older and newer versions of PHP.
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$modify_time = ' ' . $start_date->format('g:ia');
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// If the rule has an UNTIL, see if that is earlier than the end date.
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if (!empty($rrule['UNTIL'])) {
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$end_date = new DateObject($end, $timezone);
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$until_date = date_ical_date($rrule['UNTIL'], $timezone);
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if (date_format($until_date, 'U') < date_format($end_date, 'U')) {
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$end_date = $until_date;
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}
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}
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// The only valid option for an empty end date is when we have a count.
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elseif (empty($end)) {
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if (!empty($rrule['COUNT'])) {
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$end_date = NULL;
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}
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else {
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return array();
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}
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}
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else {
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$end_date = new DateObject($end, $timezone);
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}
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// Get an integer value for the interval, if none given, '1' is implied.
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if (empty($rrule['INTERVAL'])) {
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$rrule['INTERVAL'] = 1;
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}
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$interval = max(1, $rrule['INTERVAL']);
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$count = isset($rrule['COUNT']) ? $rrule['COUNT'] : NULL;
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if (empty($rrule['FREQ'])) {
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$rrule['FREQ'] = 'DAILY';
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}
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// Make sure DAILY frequency isn't used in places it won't work;
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if (!empty($rrule['BYMONTHDAY']) && !in_array($rrule['FREQ'], array('MONTHLY', 'YEARLY'))) {
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$rrule['FREQ'] = 'MONTHLY';
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}
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elseif (!empty($rrule['BYDAY']) && !in_array($rrule['FREQ'], array('MONTHLY', 'WEEKLY', 'YEARLY'))) {
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$rrule['FREQ'] = 'WEEKLY';
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}
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// Find the time period to jump forward between dates.
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switch ($rrule['FREQ']) {
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case 'DAILY':
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$jump = $interval . ' days';
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break;
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case 'WEEKLY':
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$jump = $interval . ' weeks';
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break;
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case 'MONTHLY':
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$jump = $interval . ' months';
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break;
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case 'YEARLY':
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$jump = $interval . ' years';
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break;
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}
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$rrule = date_repeat_adjust_rrule($rrule, $start_date);
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// The start date always goes into the results, whether or not it meets
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// the rules. RFC 2445 includes examples where the start date DOES NOT
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// meet the rules, but the expected results always include the start date.
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$days = array(date_format($start_date, DATE_FORMAT_DATETIME));
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// BYMONTHDAY will look for specific days of the month in one or more months.
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// This process is only valid when frequency is monthly or yearly.
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if (!empty($rrule['BYMONTHDAY'])) {
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$finished = FALSE;
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$current_day = clone($start_date);
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$direction_days = array();
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// Deconstruct the day in case it has a negative modifier.
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foreach ($rrule['BYMONTHDAY'] as $day) {
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preg_match("@(-)?([0-9]{1,2})@", $day, $regs);
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if (!empty($regs[2])) {
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// Convert parameters into full day name, count, and direction.
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$direction_days[$day] = array(
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'direction' => !empty($regs[1]) ? $regs[1] : '+',
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'direction_count' => $regs[2],
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);
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}
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}
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while (!$finished) {
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$period_finished = FALSE;
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while (!$period_finished) {
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foreach ($rrule['BYMONTHDAY'] as $monthday) {
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$day = $direction_days[$monthday];
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$current_day = date_repeat_set_month_day($current_day, NULL, $day['direction_count'], $day['direction'], $timezone, $modify_time);
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date_repeat_add_dates($days, $current_day, $start_date, $end_date, $exceptions, $rrule);
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if ($finished = date_repeat_is_finished($current_day, $days, $count, $end_date)) {
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$period_finished = TRUE;
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}
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}
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// If it's monthly, keep looping through months, one INTERVAL at a time.
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if ($rrule['FREQ'] == 'MONTHLY') {
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if ($finished = date_repeat_is_finished($current_day, $days, $count, $end_date)) {
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$period_finished = TRUE;
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}
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// Back up to first of month and jump.
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$current_day = date_repeat_set_month_day($current_day, NULL, 1, '+', $timezone, $modify_time);
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date_modify($current_day, '+' . $jump . $modify_time);
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}
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// If it's yearly, break out of the loop at the
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// end of every year, and jump one INTERVAL in years.
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else {
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if (date_format($current_day, 'n') == 12) {
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$period_finished = TRUE;
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}
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else {
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// Back up to first of month and jump.
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$current_day = date_repeat_set_month_day($current_day, NULL, 1, '+', $timezone, $modify_time);
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date_modify($current_day, '+1 month' . $modify_time);
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}
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}
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}
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if ($rrule['FREQ'] == 'YEARLY') {
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// Back up to first of year and jump.
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$current_day = date_repeat_set_year_day($current_day, NULL, NULL, 1, '+', $timezone, $modify_time);
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date_modify($current_day, '+' . $jump . $modify_time);
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}
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$finished = date_repeat_is_finished($current_day, $days, $count, $end_date);
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}
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}
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// This is the simple fallback case, not looking for any BYDAY,
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// just repeating the start date. Because of imputed BYDAY above, this
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// will only test TRUE for a DAILY or less frequency (like HOURLY).
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elseif (empty($rrule['BYDAY'])) {
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// $current_day will keep track of where we are in the calculation.
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$current_day = clone($start_date);
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$finished = FALSE;
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$months = !empty($rrule['BYMONTH']) ? $rrule['BYMONTH'] : array();
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while (!$finished) {
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date_repeat_add_dates($days, $current_day, $start_date, $end_date, $exceptions, $rrule);
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$finished = date_repeat_is_finished($current_day, $days, $count, $end_date);
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date_modify($current_day, '+' . $jump . $modify_time);
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}
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}
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else {
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// More complex searches for day names and criteria like '-1SU' or '2TU,2TH',
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// require that we interate through the whole time period checking each BYDAY.
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// Create helper array to pull day names out of iCal day strings.
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$day_names = date_repeat_dow_day_options(FALSE);
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$days_of_week = array_keys($day_names);
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// Parse out information about the BYDAYs and separate them
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// depending on whether they have directional parameters like -1SU or 2TH.
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$month_days = array();
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$week_days = array();
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// Find the right first day of the week to use, iCal rules say Monday
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// should be used if none is specified.
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$week_start_rule = !empty($rrule['WKST']) ? trim($rrule['WKST']) : 'MO';
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$week_start_day = $day_names[$week_start_rule];
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// Make sure the week days array is sorted into week order,
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// we use the $ordered_keys to get the right values into the key
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// and force the array to that order. Needed later when we
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// iterate through each week looking for days so we don't
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// jump to the next week when we hit a day out of order.
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$ordered = date_repeat_days_ordered($week_start_rule);
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$ordered_keys = array_flip($ordered);
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if ($rrule['FREQ'] == 'YEARLY' && !empty($rrule['BYMONTH'])) {
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// Additional cycle to apply month preferences.
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foreach ($rrule['BYMONTH'] as $month) {
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foreach ($rrule['BYDAY'] as $day) {
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preg_match("@(-)?([0-9]+)?([SU|MO|TU|WE|TH|FR|SA]{2})@", trim($day), $regs);
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// Convert parameters into full day name, count, and direction.
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// Add leading zero to first 9 months.
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if (!empty($regs[2])) {
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$direction_days[] = array(
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'day' => $day_names[$regs[3]],
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'direction' => !empty($regs[1]) ? $regs[1] : '+',
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'direction_count' => $regs[2],
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'month' => strlen($month) > 1 ? $month : '0' . $month,
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);
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}
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else {
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$week_days[$ordered_keys[$regs[3]]] = $day_names[$regs[3]];
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}
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}
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}
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}
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else {
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foreach ($rrule['BYDAY'] as $day) {
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preg_match("@(-)?([0-9]+)?([SU|MO|TU|WE|TH|FR|SA]{2})@", trim($day), $regs);
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if (!empty($regs[2])) {
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// Convert parameters into full day name, count, and direction.
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$direction_days[] = array(
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'day' => $day_names[$regs[3]],
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'direction' => !empty($regs[1]) ? $regs[1] : '+',
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'direction_count' => $regs[2],
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'month' => NULL,
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);
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}
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else {
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$week_days[$ordered_keys[$regs[3]]] = $day_names[$regs[3]];
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}
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}
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}
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ksort($week_days);
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// BYDAYs with parameters like -1SU (last Sun) or 2TH (second Thur)
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// need to be processed one month or year at a time.
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if (!empty($direction_days) && in_array($rrule['FREQ'], array('MONTHLY', 'YEARLY'))) {
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$finished = FALSE;
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$current_day = clone($start_date);
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while (!$finished) {
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foreach ($direction_days as $day) {
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// Find the BYDAY date in the current month.
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if ($rrule['FREQ'] == 'MONTHLY') {
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$current_day = date_repeat_set_month_day($current_day, $day['day'], $day['direction_count'], $day['direction'], $timezone, $modify_time);
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}
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else {
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$current_day = date_repeat_set_year_day($current_day, $day['month'], $day['day'], $day['direction_count'], $day['direction'], $timezone, $modify_time);
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}
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date_repeat_add_dates($days, $current_day, $start_date, $end_date, $exceptions, $rrule);
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}
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$finished = date_repeat_is_finished($current_day, $days, $count, $end_date);
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// Reset to beginning of period before jumping to next period.
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// Needed especially when working with values like 'last Saturday'
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// to be sure we don't skip months like February.
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$year = date_format($current_day, 'Y');
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$month = date_format($current_day, 'n');
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288
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if ($rrule['FREQ'] == 'MONTHLY') {
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date_date_set($current_day, $year, $month, 1);
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290
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}
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else {
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date_date_set($current_day, $year, 1, 1);
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}
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294
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// Jump to the next period.
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date_modify($current_day, '+' . $jump . $modify_time);
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}
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297
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}
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298
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299
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// For BYDAYs without parameters,like TU,TH (every Tues and Thur),
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// we look for every one of those days during the frequency period.
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// Iterate through periods of a WEEK, MONTH, or YEAR, checking for
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// the days of the week that match our criteria for each week in the
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// period, then jumping ahead to the next week, month, or year,
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// an INTERVAL at a time.
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306
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if (!empty($week_days) && in_array($rrule['FREQ'], array('MONTHLY', 'WEEKLY', 'YEARLY'))) {
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307
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$finished = FALSE;
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308
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$current_day = clone($start_date);
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$format = $rrule['FREQ'] == 'YEARLY' ? 'Y' : 'n';
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310
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$current_period = date_format($current_day, $format);
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311
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312
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// Back up to the beginning of the week in case we are somewhere in the
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313
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// middle of the possible week days, needed so we don't prematurely
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314
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// jump to the next week. The date_repeat_add_dates() function will
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315
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// keep dates outside the range from getting added.
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316
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if (date_format($current_day, 'l') != $day_names[$day]) {
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317
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date_modify($current_day, '-1 ' . $week_start_day . $modify_time);
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318
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}
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319
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while (!$finished) {
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320
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$period_finished = FALSE;
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321
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while (!$period_finished) {
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322
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$moved = FALSE;
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323
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foreach ($week_days as $delta => $day) {
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324
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// Find the next occurence of each day in this week, only add it
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325
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// if we are still in the current month or year. The date_repeat_add_dates
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326
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// function is insufficient to test whether to include this date
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327
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// if we are using a rule like 'every other month', so we must
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328
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// explicitly test it here.
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329
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|
330
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// If we're already on the right day, don't jump or we
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331
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// will prematurely move into the next week.
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332
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if (date_format($current_day, 'l') != $day) {
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333
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date_modify($current_day, '+1 ' . $day . $modify_time);
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334
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$moved = TRUE;
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335
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}
|
336
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if ($rrule['FREQ'] == 'WEEKLY' || date_format($current_day, $format) == $current_period) {
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337
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date_repeat_add_dates($days, $current_day, $start_date, $end_date, $exceptions, $rrule);
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338
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}
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339
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}
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340
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$finished = date_repeat_is_finished($current_day, $days, $count, $end_date);
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341
|
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342
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// Make sure we don't get stuck in endless loop if the current
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343
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// day never got changed above.
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344
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if (!$moved) {
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date_modify($current_day, '+1 day' . $modify_time);
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}
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347
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348
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// If this is a WEEKLY frequency, stop after each week,
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// otherwise, stop when we've moved outside the current period.
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// Jump to the end of the week, then test the period.
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351
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if ($finished || $rrule['FREQ'] == 'WEEKLY') {
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$period_finished = TRUE;
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}
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elseif ($rrule['FREQ'] != 'WEEKLY' && date_format($current_day, $format) != $current_period) {
|
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$period_finished = TRUE;
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}
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}
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358
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|
359
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if ($finished) {
|
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continue;
|
361
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}
|
362
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|
363
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// We'll be at the end of a week, month, or year when
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// we get to this point in the code.
|
365
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366
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// Go back to the beginning of this period before we jump, to
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// ensure we jump to the first day of the next period.
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368
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switch ($rrule['FREQ']) {
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case 'WEEKLY':
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date_modify($current_day, '+1 ' . $week_start_day . $modify_time);
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date_modify($current_day, '-1 week' . $modify_time);
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break;
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case 'MONTHLY':
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date_modify($current_day, '-' . (date_format($current_day, 'j') - 1) . ' days' . $modify_time);
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date_modify($current_day, '-1 month' . $modify_time);
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break;
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377
|
case 'YEARLY':
|
378
|
date_modify($current_day, '-' . date_format($current_day, 'z') . ' days' . $modify_time);
|
379
|
date_modify($current_day, '-1 year' . $modify_time);
|
380
|
break;
|
381
|
}
|
382
|
// Jump ahead to the next period to be evaluated.
|
383
|
date_modify($current_day, '+' . $jump . $modify_time);
|
384
|
$current_period = date_format($current_day, $format);
|
385
|
$finished = date_repeat_is_finished($current_day, $days, $count, $end_date);
|
386
|
}
|
387
|
}
|
388
|
}
|
389
|
|
390
|
// add additional dates
|
391
|
foreach ($additions as $addition) {
|
392
|
$date = new dateObject($addition . ' ' . $start_date->format('H:i:s'), $timezone);
|
393
|
$days[] = date_format($date, DATE_FORMAT_DATETIME);
|
394
|
}
|
395
|
|
396
|
sort($days);
|
397
|
return $days;
|
398
|
}
|
399
|
|
400
|
/**
|
401
|
* See if the RRULE needs some imputed values added to it.
|
402
|
*/
|
403
|
function date_repeat_adjust_rrule($rrule, $start_date) {
|
404
|
// If this is not a valid value, do nothing;
|
405
|
if (empty($rrule) || empty($rrule['FREQ'])) {
|
406
|
return array();
|
407
|
}
|
408
|
|
409
|
// RFC 2445 says if no day or monthday is specified when creating repeats for
|
410
|
// weeks, months, or years, impute the value from the start date.
|
411
|
|
412
|
if (empty($rrule['BYDAY']) && $rrule['FREQ'] == 'WEEKLY') {
|
413
|
$rrule['BYDAY'] = array(date_repeat_dow2day(date_format($start_date, 'w')));
|
414
|
}
|
415
|
elseif (empty($rrule['BYDAY']) && empty($rrule['BYMONTHDAY']) && $rrule['FREQ'] == 'MONTHLY') {
|
416
|
$rrule['BYMONTHDAY'] = array(date_format($start_date, 'j'));
|
417
|
}
|
418
|
elseif (empty($rrule['BYDAY']) && empty($rrule['BYMONTHDAY']) && empty($rrule['BYYEARDAY']) && $rrule['FREQ'] == 'YEARLY') {
|
419
|
$rrule['BYMONTHDAY'] = array(date_format($start_date, 'j'));
|
420
|
if (empty($rrule['BYMONTH'])) {
|
421
|
$rrule['BYMONTH'] = array(date_format($start_date, 'n'));
|
422
|
}
|
423
|
}
|
424
|
// If we are processing rules for period other than YEARLY or MONTHLY
|
425
|
// and have BYDAYS like 2SU or -1SA, simplify them to SU or SA since the
|
426
|
// position rules make no sense in other periods and just add complexity.
|
427
|
|
428
|
elseif (!empty($rrule['BYDAY']) && !in_array($rrule['FREQ'], array('MONTHLY', 'YEARLY'))) {
|
429
|
foreach ($rrule['BYDAY'] as $delta => $BYDAY) {
|
430
|
$rrule['BYDAY'][$delta] = substr($BYDAY, -2);
|
431
|
}
|
432
|
}
|
433
|
|
434
|
return $rrule;
|
435
|
}
|
436
|
|
437
|
/**
|
438
|
* Helper function to add found date to the $dates array.
|
439
|
*
|
440
|
* Check that the date to be added is between the start and end date
|
441
|
* and that it is not in the $exceptions, nor already in the $days array,
|
442
|
* and that it meets other criteria in the RRULE.
|
443
|
*/
|
444
|
function date_repeat_add_dates(&$days, $current_day, $start_date, $end_date, $exceptions, $rrule) {
|
445
|
if (isset($rrule['COUNT']) && sizeof($days) >= $rrule['COUNT']) {
|
446
|
return FALSE;
|
447
|
}
|
448
|
$formatted = date_format($current_day, DATE_FORMAT_DATETIME);
|
449
|
if (!empty($end_date) && $formatted > date_format($end_date, DATE_FORMAT_DATETIME)) {
|
450
|
return FALSE;
|
451
|
}
|
452
|
if ($formatted < date_format($start_date, DATE_FORMAT_DATETIME)) {
|
453
|
return FALSE;
|
454
|
}
|
455
|
if (in_array(date_format($current_day, 'Y-m-d'), $exceptions)) {
|
456
|
return FALSE;
|
457
|
}
|
458
|
if (!empty($rrule['BYDAY'])) {
|
459
|
$BYDAYS = $rrule['BYDAY'];
|
460
|
foreach ($BYDAYS as $delta => $BYDAY) {
|
461
|
$BYDAYS[$delta] = substr($BYDAY, -2);
|
462
|
}
|
463
|
if (!in_array(date_repeat_dow2day(date_format($current_day, 'w')), $BYDAYS)) {
|
464
|
return FALSE;
|
465
|
}}
|
466
|
if (!empty($rrule['BYYEAR']) && !in_array(date_format($current_day, 'Y'), $rrule['BYYEAR'])) {
|
467
|
return FALSE;
|
468
|
}
|
469
|
if (!empty($rrule['BYMONTH']) && !in_array(date_format($current_day, 'n'), $rrule['BYMONTH'])) {
|
470
|
return FALSE;
|
471
|
}
|
472
|
if (!empty($rrule['BYMONTHDAY'])) {
|
473
|
// Test month days, but only if there are no negative numbers.
|
474
|
$test = TRUE;
|
475
|
$BYMONTHDAYS = array();
|
476
|
foreach ($rrule['BYMONTHDAY'] as $day) {
|
477
|
if ($day > 0) {
|
478
|
$BYMONTHDAYS[] = $day;
|
479
|
}
|
480
|
else {
|
481
|
$test = FALSE;
|
482
|
break;
|
483
|
}
|
484
|
}
|
485
|
if ($test && !empty($BYMONTHDAYS) && !in_array(date_format($current_day, 'j'), $BYMONTHDAYS)) {
|
486
|
return FALSE;
|
487
|
}
|
488
|
}
|
489
|
// Don't add a day if it is already saved so we don't throw the count off.
|
490
|
if (in_array($formatted, $days)) {
|
491
|
return TRUE;
|
492
|
}
|
493
|
else {
|
494
|
$days[] = $formatted;
|
495
|
}
|
496
|
}
|
497
|
|
498
|
/**
|
499
|
* Stop when $current_day is greater than $end_date or $count is reached.
|
500
|
*/
|
501
|
function date_repeat_is_finished($current_day, $days, $count, $end_date) {
|
502
|
if (($count && sizeof($days) >= $count)
|
503
|
|| (!empty($end_date) && date_format($current_day, 'U') > date_format($end_date, 'U'))) {
|
504
|
return TRUE;
|
505
|
}
|
506
|
else {
|
507
|
return FALSE;
|
508
|
}
|
509
|
}
|
510
|
|
511
|
/**
|
512
|
* Set a date object to a specific day of the month.
|
513
|
*
|
514
|
* Example,
|
515
|
* date_set_month_day($date, 'Sunday', 2, '-')
|
516
|
* will reset $date to the second to last Sunday in the month.
|
517
|
* If $day is empty, will set to the number of days from the
|
518
|
* beginning or end of the month.
|
519
|
*/
|
520
|
function date_repeat_set_month_day($date_in, $day, $count = 1, $direction = '+', $timezone = 'UTC', $modify_time) {
|
521
|
if (is_object($date_in)) {
|
522
|
$current_month = date_format($date_in, 'n');
|
523
|
|
524
|
// Reset to the start of the month.
|
525
|
// We should be able to do this with date_date_set(), but
|
526
|
// for some reason the date occasionally gets confused if run
|
527
|
// through this function multiple times. It seems to work
|
528
|
// reliably if we create a new object each time.
|
529
|
$datetime = date_format($date_in, DATE_FORMAT_DATETIME);
|
530
|
$datetime = substr_replace($datetime, '01', 8, 2);
|
531
|
$date = new DateObject($datetime, $timezone);
|
532
|
if ($direction == '-') {
|
533
|
// For negative search, start from the end of the month.
|
534
|
date_modify($date, '+1 month' . $modify_time);
|
535
|
}
|
536
|
else {
|
537
|
// For positive search, back up one day to get outside the
|
538
|
// current month, so we can catch the first of the month.
|
539
|
date_modify($date, '-1 day' . $modify_time);
|
540
|
}
|
541
|
|
542
|
if (empty($day)) {
|
543
|
date_modify($date, $direction . $count . ' days' . $modify_time);
|
544
|
}
|
545
|
else {
|
546
|
// Use the English text for order, like First Sunday
|
547
|
// instead of +1 Sunday to overcome PHP5 bug, (see #369020).
|
548
|
$order = date_order();
|
549
|
$step = $count <= 5 ? $order[$direction . $count] : $count;
|
550
|
date_modify($date, $step . ' ' . $day . $modify_time);
|
551
|
}
|
552
|
|
553
|
// If that takes us outside the current month, don't go there.
|
554
|
if (date_format($date, 'n') == $current_month) {
|
555
|
return $date;
|
556
|
}
|
557
|
}
|
558
|
return $date_in;
|
559
|
}
|
560
|
|
561
|
/**
|
562
|
* Set a date object to a specific day of the year.
|
563
|
*
|
564
|
* Example,
|
565
|
* date_set_year_day($date, 'Sunday', 2, '-')
|
566
|
* will reset $date to the second to last Sunday in the year.
|
567
|
* If $day is empty, will set to the number of days from the
|
568
|
* beginning or end of the year.
|
569
|
*/
|
570
|
function date_repeat_set_year_day($date_in, $month, $day, $count = 1, $direction = '+', $timezone = 'UTC', $modify_time) {
|
571
|
if (is_object($date_in)) {
|
572
|
$current_year = date_format($date_in, 'Y');
|
573
|
|
574
|
// Reset to the start of the month.
|
575
|
// See note above.
|
576
|
$datetime = date_format($date_in, DATE_FORMAT_DATETIME);
|
577
|
$month_key = isset($month) ? $month : '01';
|
578
|
$datetime = substr_replace($datetime, $month_key . '-01', 5, 5);
|
579
|
$date = new DateObject($datetime, $timezone);
|
580
|
|
581
|
if (isset($month)) {
|
582
|
if ($direction == '-') {
|
583
|
// For negative search, start from the end of the month.
|
584
|
$modifier = '+1 month';
|
585
|
}
|
586
|
else {
|
587
|
// For positive search, back up one day to get outside the
|
588
|
// current month, so we can catch the first of the month.
|
589
|
$modifier = '-1 day';
|
590
|
}
|
591
|
}
|
592
|
else {
|
593
|
if ($direction == '-') {
|
594
|
// For negative search, start from the end of the year.
|
595
|
$modifier = '+1 year';
|
596
|
}
|
597
|
else {
|
598
|
// For positive search, back up one day to get outside the
|
599
|
// current year, so we can catch the first of the year.
|
600
|
$modifier = '-1 day';
|
601
|
}
|
602
|
}
|
603
|
|
604
|
date_modify($date, $modifier . $modify_time);
|
605
|
|
606
|
if (empty($day)) {
|
607
|
date_modify($date, $direction . $count . ' days' . $modify_time);
|
608
|
}
|
609
|
else {
|
610
|
// Use the English text for order, like First Sunday
|
611
|
// instead of +1 Sunday to overcome PHP5 bug, (see #369020).
|
612
|
$order = date_order();
|
613
|
$step = $count <= 5 ? $order[$direction . $count] : $count;
|
614
|
date_modify($date, $step . ' ' . $day . $modify_time);
|
615
|
}
|
616
|
|
617
|
// If that takes us outside the current year, don't go there.
|
618
|
if (date_format($date, 'Y') == $current_year) {
|
619
|
return $date;
|
620
|
}
|
621
|
}
|
622
|
return $date_in;
|
623
|
}
|