timezone_offset_get()

(PHP 5 >= 5.2.0, PHP 7)

别名DateTimeZone::getOffset()

说明

此函数是该函数的别名：DateTimeZone::getOffset()

Hi,
This might help someone with timezone differences. I wanted to find the offset in seconds between my timezone and a remote timezone so I wrote this function and it seems to work well for me.
<?php
/**  Returns the offset from the origin timezone to the remote timezone, in seconds.
*  @param $remote_tz;
*  @param $origin_tz; If null the servers current timezone is used as the origin.
*  @return int;
*/
function get_timezone_offset($remote_tz, $origin_tz = null) {
  if($origin_tz === null) {
    if(!is_string($origin_tz = date_default_timezone_get())) {
      return false; // A UTC timestamp was returned -- bail out!
    }
  }
  $origin_dtz = new DateTimeZone($origin_tz);
  $remote_dtz = new DateTimeZone($remote_tz);
  $origin_dt = new DateTime("now", $origin_dtz);
  $remote_dt = new DateTime("now", $remote_dtz);
  $offset = $origin_dtz->getOffset($origin_dt) - $remote_dtz->getOffset($remote_dt);
  return $offset;
}
?>
Examples:
<?php
// This will return 10800 (3 hours) ...
$offset = get_timezone_offset('America/Los_Angeles','America/New_York');
// or, if your server time is already set to 'America/New_York'...
$offset = get_timezone_offset('America/Los_Angeles');
// You can then take $offset and adjust your timestamp.
$offset_time = time() + $offset;
?>
Happy Coding!!

The following extended example may make the usage clearer; 
<?php
// Create two timezone objects, one for Taipei (Taiwan) and one for
// Tokyo (Japan)
$dateTimeZoneTaipei = new DateTimeZone("Asia/Taipei");
$dateTimeZoneJapan = new DateTimeZone("Asia/Tokyo");
// Create two DateTime objects that will contain the same Unix timestamp, but
// have different timezones attached to them.
$dateTimeTaipei = new DateTime("now", $dateTimeZoneTaipei);
$dateTimeJapan = new DateTime("now", $dateTimeZoneJapan);
// NOTE: $dateTimeJapan is not used further in this example
// Calculate the GMT offset for the date/time contained in the $dateTimeTaipei
// object, but using the timezone rules as defined for Tokyo
// ($dateTimeZoneJapan).
$timeOffset = $dateTimeZoneJapan->getOffset($dateTimeTaipei);
// Should show int(32400) (for dates after Sat Sep 8 01:00:00 1951 JST).
print("Number of seconds Japan is ahead of GMT at the specific time: ");
var_dump($timeOffset);
print("<br />Number of seconds Taipei is ahead of GMT at the specific time: ");
var_dump($dateTimeZoneTaipei->getOffset($dateTimeTaipei));
print("<br />Number of seconds Japan is ahead of Taipei at the specific time: ");
var_dump($dateTimeZoneJapan->getOffset($dateTimeTaipei)
   -$dateTimeZoneTaipei->getOffset($dateTimeTaipei));
print("<hr />");
?>
Number of seconds Japan is ahead of GMT at the specific time: int(32400)
Number of seconds Taipei is ahead of GMT at the specific time: int(28800)
Number of seconds Japan is ahead of Taipei at the specific time: int(3600)