This indicator is basically just a back-testing tool. All it does is highlight the background of your charts with the specified color within the specified timezone.
This is useful particularly for back-testing purposes, such as testing a day-trading strategy within a particular period of the day or ignoring signals that fall within the given timeframe (which is useful for ignoring setups during your testing that appear while you're asleep or at work etc.)
Take it easy :)
- Matt.