Adjust Current Time - Provides a ready means of adjusting, or offsetting, the time for the Sunlight Curve plot to show what it was, or will be, for another time of day or night.There is an input box for the day, month and time of day.
The Current button will apply the current local time again if required.
The Offset shown is an indication of the difference between your current, actual time and the time entered in this window.
The UTC/GMT time is a corresponding time for the entered, offset time.