iso8601_to_datetime( string $date_string, string $timezone = ‘user’ )

将post_date[u gmt]使用的iso8601（Y m dTH:i:sO）日期转换为MySQL DateTime（Y-m-d H:i:s）格式。
Converts an iso8601 (YmdTH:i:sO) date to MySQL DateTime (Y-m-d H:i:s) format used by post_date[_gmt].

目录锚点：#参数#返回#源码

参数（Parameters）

返回（Return）

（string|bool）MySQL date time格式的日期和时间-Y-m-d H:i:s，或失败时为false。

源码（Source）

/**
 * Converts an iso8601 date to MySQL DateTime format used by post_date[_gmt].
 *
 * @since 1.5.0
 *
 * @param string $date_string Date and time in ISO 8601 format {@link http://en.wikipedia.org/wiki/ISO_8601}.
 * @param string $timezone    Optional. If set to GMT returns the time minus gmt_offset. Default is 'user'.
 * @return string The date and time in MySQL DateTime format - Y-m-d H:i:s.
 */
function iso8601_to_datetime( $date_string, $timezone = 'user' ) {
	$timezone = strtolower($timezone);

	if ($timezone == 'gmt') {

		preg_match('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z|[+|-][0-9]{2,4}){0,1}#', $date_string, $date_bits);

		if (!empty($date_bits[7])) { // we have a timezone, so let's compute an offset
			$offset = iso8601_timezone_to_offset($date_bits[7]);
		} else { // we don't have a timezone, so we assume user local timezone (not server's!)
			$offset = HOUR_IN_SECONDS * get_option('gmt_offset');
		}

		$timestamp = gmmktime($date_bits[4], $date_bits[5], $date_bits[6], $date_bits[2], $date_bits[3], $date_bits[1]);
		$timestamp -= $offset;

		return gmdate('Y-m-d H:i:s', $timestamp);

	} elseif ($timezone == 'user') {
		return preg_replace('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z|[+|-][0-9]{2,4}){0,1}#', '$1-$2-$3 $4:$5:$6', $date_string);
	}
}