The time parameter of the history display defaults to the past 24 hours. However, you can select a different period with this panel as follows:

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Date and Time selector for anchor (defaults to today and now, cannot be in the future)
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Use the Date/Time anchor as END or START data (click to toggle)
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Time Span to display in hours.
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Click here to activate the display.
Graphs will be shown covering the selected time span provided trace data have been collected. It will be truncated if the start date/time and the duration would be in the future.