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iso8601_timezone_to_offset ( $timezone )
Given an ISO 8601 timezone, returns its UTC offset in seconds.
function iso8601_timezone_to_offset( $timezone ) { // $timezone is either 'Z' or '[+|-]hhmm'. if ( 'Z' === $timezone ) { $offset = 0; } else { $sign = ( '+' === substr( $timezone, 0, 1 ) ) ? 1 : -1; $hours = (int) substr( $timezone, 1, 2 ); $minutes = (int) substr( $timezone, 3, 4 ) / 60; $offset = $sign * HOUR_IN_SECONDS * ( $hours + $minutes ); } return $offset; }