Method onCheckTimeZoneOffset

Sming/Core/SystemClock.h:132–135

* @brief Set/clear a callback which is invoked whenever local time is queried. * @note This callback is *only* invoked when `now()` is called. */

	 * @note This callback is *only* invoked when `now()` is called.
	 */
	void onCheckTimeZoneOffset(CheckTimeZoneOffset callback)
	{
		checkTimeZoneOffset = callback;
	}

private:
	CheckTimeZoneOffset checkTimeZoneOffset;