使用PHP获取特定时刻的时区

Question

I was wondering if there was a way to use PHP to generate a list of all current timezones that are at a particular hour?

eg. all global locations with the current time of 09:00.

Would PHP automatically account for daylight savings also?

Anything I come across here or other sites are either countdowns or display every timezone. I only want the code to spit out those at the set hour and ignore others until it's said time there.

Answer 1

You could try something like this

1. Create a DateTime instance representing the current instant
2. Iterate over all the timezones PHP knows about
3. Filter the list for timezones who's current, formatted time matches your criteria

Something like this assuming you want all zones with the current hour being 9am (so any time between 09:00 and 09:59)

$now = new DateTime();
$searchHour = 9;
$zones = array_filter(DateTimeZone::listIdentifiers(), function($tz) use ($now, $searchHour) {
    return $now->setTimezone(new DateTimeZone($tz))->format('G') == $searchHour;
});

Demo ~ https://eval.in/889126

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If you want to get a list of zone identifiers without their country / area prefix, try something like this...

$shortZones = array_map(function($tz) {
    // Turn "_" to " " and return the last part after "/"
    return str_replace('_', ' ', substr(strstr($tz, '/'), 1));
}, $zones);