The log file must have data for the graph to use. Data is displayed from the last setting made on the previous run of ClockWatch backward toward the first setting. Increasing the number of data points shows earlier data if available.
Drift is an indication of how accurate the system clock is over time.
Settings where there is no time change are ignored for the drift calculation. The horizontal axis shows the time settings - the date or time of the actual setting is shown across the bottom of the graph. Settings where the system clock was within 1 second of standard will show as setting with no time difference and no clock drift. Upon redraw, the selected graph will then be in the leftmost position of the graph area of the main screen. The Options screen contains tabs for setting options in the ClockWatch application.