get_date_from_gmt() WP 1.0

Converts a GMT date into the correct format for the blog.

Requires and returns a date in the Y-m-d H:i:s format. If there is a timezone_string available, the returned date is in that timezone, otherwise it simply adds the value of gmt_offset. Return format can be overridden using the $format parameter

No Hooks.

Return

String. Formatted date relative to the timezone / GMT offset.

Usage

get_date_from_gmt( $string, $format );

$string(string) (required)

The date to be converted.

$format(string)

The format string for the returned date (default is Y-m-d H:i:s)
Default: 'Y-m-d H:i:s'

Code of get date from gmt: wp-includes/formatting.php ^{WP 5.2.2}

<?php
function get_date_from_gmt( $string, $format = 'Y-m-d H:i:s' ) {
	$tz = get_option( 'timezone_string' );
	if ( $tz ) {
		$datetime = date_create( $string, new DateTimeZone( 'UTC' ) );
		if ( ! $datetime ) {
			return date( $format, 0 );
		}
		$datetime->setTimezone( new DateTimeZone( $tz ) );
		$string_localtime = $datetime->format( $format );
	} else {
		if ( ! preg_match( '#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches ) ) {
			return date( $format, 0 );
		}
		$string_time      = gmmktime( $matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1] );
		$string_localtime = gmdate( $format, $string_time + get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );
	}
	return $string_localtime;
}

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From tag: date time