/**
* AgaviTimeZone API.
*
* @see AgaviTimeZone::useDaylightTime()
*
* @author Dominik del Bondio <*****@*****.**>
* @author The ICU Project
* @since 0.11.0
*/
public function useDaylightTime()
{
// If DST was observed in 1942 (for example) but has never been
// observed from 1943 to the present, most clients will expect
// this method to return FALSE. This method determines whether
// DST is in use in the current year (at any point in the year)
// and returns TRUE if so.
$days = floor(AgaviCalendar::getNow() / AgaviDateDefinitions::MILLIS_PER_DAY);
// epoch days
$year = 0;
$month = 0;
$dom = 0;
$dow = 0;
AgaviCalendarGrego::dayToFields($days, $year, $month, $dom, $dow);
if ($year > $this->finalYear) {
// [sic] >, not >=; see above
if ($this->finalZone) {
return $this->finalZone->useDaylightTime();
} else {
return true;
}
}
// Find start of this year, and start of next year
$start = (int) AgaviCalendarGrego::fieldsToDay($year, 0, 1) * AgaviDateDefinitions::SECONDS_PER_DAY;
$limit = (int) AgaviCalendarGrego::fieldsToDay($year + 1, 0, 1) * AgaviDateDefinitions::SECONDS_PER_DAY;
// Return TRUE if DST is observed at any time during the current year.
for ($i = 0, $transitionCount = count($this->transitions); $i < $transitionCount; ++$i) {
if ($this->transitions[$i]['time'] >= $limit) {
break;
}
if ($this->transitions[$i]['time'] >= $start && $this->types[$this->transitions[$i]['type']]['dstOffset'] != 0 || $this->transitions[$i]['time'] > $start && $i > 0 && $this->types[$this->transitions[$i - 1]['type']]['dstOffset'] != 0) {
return true;
}
}
return false;
}
