The IntlCalendar::inDaylightTime() function is an inbuilt function in PHP which is used to check whether the object time is in Daylight Savings Time or not.
Syntax:
- Object oriented style
bool public IntlCalendar::inDaylightTime( void )
- Procedural style
bool intlcal_in_daylight_time( IntlCalendar $cal )
Parameters: This function accepts single parameter $cal which hold the resource of IntlCalendar object.
Return Value: This function returns TRUE if the date is in Daylight Savings Time and FALSE otherwise.
Below program illustrates the IntlCalendar::inDaylightTime() function in PHP:
Program:
<?php   // Set the DateTime zone ini_set('date.timezone', 'Europe/Lisbon');   // Create an instance of IntlCalendar $calendar = IntlCalendar::createInstance('Europe/Lisbon');   // Check whether the object time is in // Daylight Savings Time or not var_dump($calendar->inDaylightTime());   // Set the month field of IntlCalendar $calendar->set(IntlCalendar::FIELD_MONTH, 11);   // Check whether the object time is in // Daylight Savings Time or not var_dump($calendar->inDaylightTime());   // Declare a IntlGregorianCalendar object $calendar = new IntlGregorianCalendar(2019, 8, 24, 12, 40, 10);   // Check whether the object time is in // Daylight Savings Time or not var_dump($calendar->inDaylightTime());   // Set the date to DateTime object $calendar->set(2019, 8, 24);   // Check whether the object time is in // Daylight Savings Time or not var_dump($calendar->inDaylightTime());   ?> |
Output:
bool(true) bool(false) bool(true) bool(true)
Reference: https://www.php.net/manual/en/intlcalendar.indaylighttime.php
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