IntlCalendar::inDaylightTime

(PHP 5 >= 5.5.0, PHP 7, PECL >= 3.0.0a1)

IntlCalendar::inDaylightTime — Whether the object?s time is in Daylight Savings Time

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public IntlCalendar::inDaylightTime ( void ) : bool

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intlcal_in_daylight_time ( IntlCalendar $cal ) : bool

Whether, for the instant represented by this object and for this object?s timezone, daylight saving time is in place.

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cal

The IntlCalendar resource.

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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.

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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