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Here's a start: nb = EvaluationNotebook[] (* or NotebookOpen["file.nb"] or whatever *) SetOptions[#, CellChangeTimes -> {}] & /@ Cells[nb] This nixes all the times. Of course one could do the following SetOptions[#, CellChangeTimes -> f[#]] & /@ Cells[nb] where f computes the cell change times you wish to keep, perhaps using ...