IntlCalendar::inDaylightTime
(PHP 5 >= 5.5.0, PHP 7, PECL >= 3.0.0a1)
IntlCalendar::inDaylightTime — Whether the objectʼs time is in Daylight Savings Time
Description
Object oriented style
public IntlCalendar::inDaylightTime ( ) : bool
Procedural style
intlcal_in_daylight_time ( IntlCalendar $cal ) : bool
Whether, for the instant represented by this object and for this objectʼs timezone, daylight saving time is in place.
Parameters
-
cal -
The IntlCalendar resource.
Return Values
Returns true if the date is in Daylight Savings Time, false otherwise. The value false may also be returned on failure, for instance after specifying invalid field values on non-lenient mode; use exceptions or query intl_get_error_code() to disambiguate.
Examples
Example #1 IntlCalendar::inDaylightTime()
<?php
ini_set('date.timezone', 'Europe/Lisbon');
ini_set('intl.default_locale', 'pt_PT');
$cal = new IntlGregorianCalendar(2013, 6 /* July */, 1, 4, 56, 31);
var_dump($cal->inDaylightTime()); // true
$cal->set(IntlCalendar::FIELD_MONTH, 11 /* December */);
var_dump($cal->inDaylightTime()); // false
//DST end transition on 2013-10-27 at 0200 (wall time back 1 hour)
$cal = new IntlGregorianCalendar(2013, 9 /* October */, 27, 1, 30, 0);
var_dump($cal->inDaylightTime()); // false (default WALLTIME_LAST)
$cal->setRepeatedWallTimeOption(IntlCalendar::WALLTIME_FIRST);
$cal->set(IntlCalendar::FIELD_HOUR_OF_DAY, 1); // force time recalculation
var_dump($cal->inDaylightTime()); // true
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https://www.php.net/manual/en/intlcalendar.indaylighttime.php