get_post_modified_time( string $format = 'U', bool $gmt = false, int|WP_Post|null $post = null, bool $translate = false ): string|int|false

3283function get_post_modified_time( $format = 'U', $gmt = false, $post = null, $translate = false ) {3284	$post = get_post( $post );3285 3286	if ( ! $post ) {3287		return false;3288	}3289 3290	$source   = ( $gmt ) ? 'gmt' : 'local';3291	$datetime = get_post_datetime( $post, 'modified', $source );3292 3293	if ( false === $datetime ) {3294		return false;3295	}3296 3297	if ( 'U' === $format || 'G' === $format ) {3298		$time = $datetime->getTimestamp();3299 3300		// Returns a sum of timestamp with timezone offset. Ideally should never be used.3301		if ( ! $gmt ) {3302			$time += $datetime->getOffset();3303		}3304	} elseif ( $translate ) {3305		$time = wp_date( $format, $datetime->getTimestamp(), $gmt ? new DateTimeZone( 'UTC' ) : null );3306	} else {3307		if ( $gmt ) {3308			$datetime = $datetime->setTimezone( new DateTimeZone( 'UTC' ) );3309		}3310 3311		$time = $datetime->format( $format );3312	}3313 3314	/**3315	 * Filters the localized time a post was last modified.3316	 *3317	 * @since 2.8.03318	 *3319	 * @param string|int $time   Formatted date string or Unix timestamp if `$format` is 'U' or 'G'.3320	 * @param string     $format Format to use for retrieving the time the post was modified.3321	 *                           Accepts 'G', 'U', or PHP date format. Default 'U'.3322	 * @param bool       $gmt    Whether to retrieve the GMT time. Default false.3323	 */3324	return apply_filters( 'get_post_modified_time', $time, $format, $gmt );3325}