Automatically write a timestamp, your own custom value, or the editing user's email into a cell whenever you edit a watched column. Set it up once per sheet, it runs itself from then on.
Stamp the current date/time, any fixed text you choose, or the email of whoever made the edit
Per-row "last updated" tracking, or a single fixed "sheet last touched" cell
Only stamp when the edited value matches a condition you define
Multi-row edits stamp every qualifying row, not just single cells
Configure as many watched ranges as you need, each with its own rules
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