1. Components of date and time.
2. Now there are 8 styles.
3. How to use the function of SetDateTime to change the value of date and time.
gauge.SetDateTime( "DateTime1", 2015, 18, 20, 16, 30, 0 );
gauge.SetDateTime( "DateTime1", 2015, 18, 20, 0, 0, 0 );
gauge.SetDateTime( "DateTime1", 0, 0, 0, 16, 30, 0 );