About relative time mode

For the relative time mode, a base value (such as 0:00:00.0) is used for the start time of the chart, and the end time is calculated based on the time span for the query. Switching to relative mode does not change the data shown in the chart nor the actual start and end time of the trend query. Only the time axis is updated.

To use relative time

On the View menu, in the Time group, select Relative.

For example, the following chart shows five minutes of data in relative mode. The query for the data starts at 12:00:00 and ends at 12:05:00, but the time axis shows a start time of 0:00:00 and an end time of +0:05:00.

In relative time mode:

• The times shown for the time axis cursors, if enabled, are relative times. For details on the display format for times, see Time offset formats.

• The time fields in the Time Bar are relative times. The first field is the base time (for example, 0:00:00.000), and the second field is the timespan of the query. The third field is the end time of the query (the base time plus the timespan). To offset the time for the query, adjust the base time (for example, 1:00:00.000 to offset it by +1 hour).
  The first field (the base time) defaults to 0:00:00 when you switch to relative mode.

• The Tag List shows the actual start time for the tag data in the Start Time column.

• The Tag Properties dialog box shows the start time option. For more information, see Configure trend options for a tag.