iso8601_timezone_to_offset( string $timezone )

从iso8601时区计算以秒为单位的偏移量。
Computes an offset in seconds from an iso8601 timezone.

目录锚点：#参数#返回#源码

参数（Parameters）

返回（Return）

（int|float）以秒为单位的偏移量。

源码（Source）

/**
 * Computes an offset in seconds from an iso8601 timezone.
 *
 * @since 1.5.0
 *
 * @param string $timezone Either 'Z' for 0 offset or '±hhmm'.
 * @return int|float The offset in seconds.
 */
function iso8601_timezone_to_offset( $timezone ) {
	// $timezone is either 'Z' or '[+|-]hhmm'
	if ($timezone == 'Z') {
		$offset = 0;
	} else {
		$sign    = (substr($timezone, 0, 1) == '+') ? 1 : -1;
		$hours   = intval(substr($timezone, 1, 2));
		$minutes = intval(substr($timezone, 3, 4)) / 60;
		$offset  = $sign * HOUR_IN_SECONDS * ($hours + $minutes);
	}
	return $offset;
}