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date_i18n() WP 1.0

Retrieve the date in localized format, based on timestamp.

If the locale specifies the locale month and weekday, then the locale will take over the format for the date. If it isn't, then the date format string will be used instead.

  • Global. WP_Locale. $wp_locale
Is the basis for: mysql2date()
Hooks from function:
Return

String. The date, translated if locale specifies it.

Usage

date_i18n( $dateformatstring, $unixtimestamp, $gmt );
$dateformatstring(string) (required)
Format to display the date.
$unixtimestamp(true/false/int)
Unix timestamp.
Default: false
$gmt(true/false)
Whether to use GMT timezone.
Default: false

Code of date_i18n: wp-includes/functions.php VER 4.9.8

<?php
function date_i18n( $dateformatstring, $unixtimestamp = false, $gmt = false ) {
	global $wp_locale;
	$i = $unixtimestamp;

	if ( false === $i ) {
		$i = current_time( 'timestamp', $gmt );
	}

	/*
	 * Store original value for language with untypical grammars.
	 * See https://core.trac.wordpress.org/ticket/9396
	 */
	$req_format = $dateformatstring;

	if ( ( !empty( $wp_locale->month ) ) && ( !empty( $wp_locale->weekday ) ) ) {
		$datemonth = $wp_locale->get_month( date( 'm', $i ) );
		$datemonth_abbrev = $wp_locale->get_month_abbrev( $datemonth );
		$dateweekday = $wp_locale->get_weekday( date( 'w', $i ) );
		$dateweekday_abbrev = $wp_locale->get_weekday_abbrev( $dateweekday );
		$datemeridiem = $wp_locale->get_meridiem( date( 'a', $i ) );
		$datemeridiem_capital = $wp_locale->get_meridiem( date( 'A', $i ) );
		$dateformatstring = ' '.$dateformatstring;
		$dateformatstring = preg_replace( "/([^\\\])D/", "\\1" . backslashit( $dateweekday_abbrev ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])F/", "\\1" . backslashit( $datemonth ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])l/", "\\1" . backslashit( $dateweekday ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])M/", "\\1" . backslashit( $datemonth_abbrev ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])a/", "\\1" . backslashit( $datemeridiem ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])A/", "\\1" . backslashit( $datemeridiem_capital ), $dateformatstring );

		$dateformatstring = substr( $dateformatstring, 1, strlen( $dateformatstring ) -1 );
	}
	$timezone_formats = array( 'P', 'I', 'O', 'T', 'Z', 'e' );
	$timezone_formats_re = implode( '|', $timezone_formats );
	if ( preg_match( "/$timezone_formats_re/", $dateformatstring ) ) {
		$timezone_string = get_option( 'timezone_string' );
		if ( $timezone_string ) {
			$timezone_object = timezone_open( $timezone_string );
			$date_object = date_create( null, $timezone_object );
			foreach ( $timezone_formats as $timezone_format ) {
				if ( false !== strpos( $dateformatstring, $timezone_format ) ) {
					$formatted = date_format( $date_object, $timezone_format );
					$dateformatstring = ' '.$dateformatstring;
					$dateformatstring = preg_replace( "/([^\\\])$timezone_format/", "\\1" . backslashit( $formatted ), $dateformatstring );
					$dateformatstring = substr( $dateformatstring, 1, strlen( $dateformatstring ) -1 );
				}
			}
		}
	}
	$j = @date( $dateformatstring, $i );

	/**
	 * Filters the date formatted based on the locale.
	 *
	 * @since 2.8.0
	 *
	 * @param string $j          Formatted date string.
	 * @param string $req_format Format to display the date.
	 * @param int    $i          Unix timestamp.
	 * @param bool   $gmt        Whether to convert to GMT for time. Default false.
	 */
	$j = apply_filters( 'date_i18n', $j, $req_format, $i, $gmt );
	return $j;
}

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