wp-includes/functions.php:179Retrieves the date in localized format, based on a sum of Unix timestamp and timezone offset in seconds.
$formatstring$timestamp_with_offsetint|booloptionalfalse$gmtbooloptionalfalsestringOne hook fires while date_i18n() runs, in this order:
Filters the date formatted based on the locale.
function date_i18n( $format, $timestamp_with_offset = false, $gmt = false ) { $timestamp = $timestamp_with_offset; // If timestamp is omitted it should be current time (summed with offset, unless `$gmt` is true). if ( ! is_numeric( $timestamp ) ) { // phpcs:ignore WordPress.DateTime.CurrentTimeTimestamp.Requested $timestamp = current_time( 'timestamp', $gmt ); } /* * This is a legacy implementation quirk that the returned timestamp is also with offset. * Ideally this function should never be used to produce a timestamp. */ if ( 'U' === $format ) { $date = $timestamp; } elseif ( $gmt && false === $timestamp_with_offset ) { // Current time in UTC. $date = wp_date( $format, null, new DateTimeZone( 'UTC' ) ); } elseif ( false === $timestamp_with_offset ) { // Current time in site's timezone. $date = wp_date( $format ); } else { /* * Timestamp with offset is typically produced by a UTC `strtotime()` call on an input without timezone. * This is the best attempt to reverse that operation into a local time to use. */ $local_time = gmdate( 'Y-m-d H:i:s', $timestamp ); $timezone = wp_timezone(); $datetime = date_create( $local_time, $timezone ); $date = wp_date( $format, $datetime->getTimestamp(), $timezone ); } /** * Filters the date formatted based on the locale. * * @since 2.8.0 * * @param string $date Formatted date string. * @param string $format Format to display the date. * @param int $timestamp A sum of Unix timestamp and timezone offset in seconds. * Might be without offset if input omitted timestamp but requested GMT. * @param bool $gmt Whether to use GMT timezone. Only applies if timestamp was not provided. */ $date = apply_filters( 'date_i18n', $date, $format, $timestamp, $gmt ); return $date;}Introduced in 0.71. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.