It depends how you want the sheet to function. If you use Edit>Find and Replace... find a.m. replace with AM, find p.m. replace with PM it automatically converts.

On 29/06/2023 08:31, James wrote:
I have text fields like:

10:06:59 a.m.
8:57:36 p.m.

How do I convert them to 24-hour time fields?


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