PHP | IntlCalendar inDaylightTime() Function

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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