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


  • 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.


Basic Examples  (1)

Create a notebook with a single cell:

Change the cell's contents:

Check when the cell was changed:

Convert the absolute time to a standard date format:

Introduced in 2007