IntlCalendar::inDaylightTime()
(PHP 5 >= 5.5.0, PHP 7, PECL >= 3.0.0a1)
Whether the objectʼs time is in Daylight Savings Time
说明
面向对象风格public IntlCalendar::inDaylightTime(void): bool
过程化风格
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.
参数
- $cal
The IntlCalendar resource.
返回值
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.
范例
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