Each time the Historical Data Viewer page opens, it always displays a time period up to and including the current moment. There are two methods you can use to review data from an earlier date: you can use the calendar button, or you can move the date slider to the left. Of these two, the calendar button will usually be the easiest to use when you are looking for the data from a specific day.
To select a start date:
1. Click the Select Start Date button in the tool bar on the Historical Data Viewer page.

The calendar will open to the current month.
2. Use the << button to move backward through the months, or the >> button to move forward through the months.

3. Click on the date whose logged data you wish to view.
The calendar closes, and the date you selected is displayed beneath the time period under the graph, and just above the scroll bar.
You can use the duration drop-down list to the immediate left of the Select Start Date button to modify the time period on the day you've just selected. See: HDV Time Scale and Date/Time Scroll Bar.