Time Overview
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Time series plots and area graphs use a time series scale for the x-axis. Time units are specified in the Time tab of the Time/Scale subdialog box. The time series scale can be:

·    Index values (integers representing generic time units)

·    Time units

-    Calendar units (days, months, quarters, or years)

-    Clock units (days, hours, minutes, or seconds)

·    Stamp values from a column

You can customize time units, start times, and increment times for index, calendar, and clock scales. See the chart below for ranges and default start values. The default increments are 1 unit.