A date series is used to fill a series with dates. The date can be increased by either a day, a week, a month or a year each time. This is one of the Fill Series options Excel provides.
numerical
a serial value to the date
In excel it is the lowest value for a specific category or series in a lookup table.
Format / Cells / Date
Series.
The name of the series, the values in the series and the category labels.
date
ask me plz...
You do not. Excel does not record the change date of an individual cell.
ametym a
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It would be a group of cells in Excel that have values in them. These can then be identified for use in creating charts in Excel. Different charts need data series for them to show.