Вы попробовали ü
(Гј) и Ü
(Гњ)?
можно найти, как ввести другие буквы здесь .
I've found a method which works using PHP's DateTimezone class (PHP 5.2+)
function timezoneDoesDST($tzId) {
$tz = new DateTimeZone($tzId);
$trans = $tz->getTransitions();
return ((count($trans) && $trans[count($trans) - 1]['ts'] > time()));
}
or, if you're running PHP 5.3+
function timezoneDoesDST($tzId) {
$tz = new DateTimeZone($tzId);
return count($tz->getTransitions(time())) > 0;
}
The getTransitions()
function gives you information about each time the offset changes for a timezone. This includes historical data (Brisbane had daylight savings in 1916.. who knew?), so this function checks if there's an offset change in the future or not.
I don't think so, but since almost every country that observes DST changes its time for an entire season or two, you could try to test 4 points during any given year.
For example, test date("I", $date)
for 2009/01/01, 2009/04/01, 2009/07/01 and 2009/10/01. If that timezone falls into DST, then at least one of those dates will return 1.
DateTimeZone::getTransitions might help.
You could probably wing it:
$hasDst = date("I", strtotime('June 1')) !== date("I", strtotime('Jan 1'));
Otherwise you'd need to parse the text-based zoneinfo data files.
На самом деле метод nickf у меня не работал, поэтому я немного переработал его ...
/**
* Finds wherever a TZ is experimenting dst or not
* @author hertzel Armengol <emudojo @ gmail.com>
* @params string TimeZone -> US/Pacific for example
*
*/
function timezoneExhibitsDST($tzId) {
$tz = new DateTimeZone($tzId);
$date = new DateTime("now",$tz);
$trans = $tz->getTransitions();
foreach ($trans as $k => $t)
if ($t["ts"] > $date->format('U')) {
return $trans[$k-1]['isdst'];
}
}
// Usage
var_dump(timezoneExhibitsDST("US/Pacific")); --> prints false
var_dump(timezoneExhibitsDST("Europe/London")); --> prints false
var_dump(timezoneExhibitsDST("America/Chicago")); --> prints false
тот же вызов функции вернет истину через 1 месяц (март), надеюсь, это поможет
{{ 1}}дата должна быть в часовом поясе пользователя / сервера, чтобы она работала, и вы не можете использовать диапазон с датой, как в случае с getTransitions
{{1} }