CellChangeTimes

is an option to Cell that specifies when changes were made to the cell.

Details

The setting for CellChangeTimes is a list containing AbsoluteTime numbers for time zone 0 (GMT).
The menu item Notebook History displays an overview of cell change times for a notebook, given in your local time zone.
If many cell changes are made close together, the start and end times appear in a sublist within the setting for CellChangeTimes.

Create a notebook with a single cell:

Wolfram Language code:

n = CreateDocument[];
Paste[n, "a"]

Change the cell's contents:

Wolfram Language code:

Paste[n, "b"];
SelectionMove[n, All, Cell]

Check when the cell was changed:

Wolfram Language code: CurrentValue[NotebookSelection[n], CellChangeTimes]

Convert the absolute time to a standard date format:

Wolfram Language code: DateString[First[%]]

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