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PHP : Function Reference : Date and Time Functions : timezone_offset_get

timezone_offset_get

Returns the timezone offset from GMT (PHP 5 >= 5.1.0)
int timezone_offset_get ( DateTimeZone object, DateTime datetime )
int DateTimeZone::getOffset ( DateTime datetime )

This function returns the offset to GMT for the date/time specified in the datetime parameter. The GMT offset is calculated with the timezone information contained in the DateTime object being used.

Parameters

object

DateTimeZone object.

datetime

DateTime that contains the date/time to compute the offset from.

Return Values

Returns time zone offset in seconds on success or FALSE on failure.

Examples

Example 469. timezone_offset_get() examples

<?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);

// 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).
var_dump($timeOffset);
?>


Code Examples / Notes » timezone_offset_get

richard

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)


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checkdate
date_create
date_date_set
date_default_timezone_get
date_default_timezone_set
date_format
date_isodate_set
date_modify
date_offset_get
date_parse
date_sun_info
date_sunrise
date_sunset
date_time_set
date_timezone_get
date_timezone_set
date
getdate
gettimeofday
gmdate
gmmktime
gmstrftime
idate
localtime
microtime
mktime
strftime
strptime
strtotime
time
timezone_abbreviations_list
timezone_identifiers_list
timezone_name_from_abbr
timezone_name_get
timezone_offset_get
timezone_open
timezone_transitions_get
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