I have just come back from France, and presumably the time zone has changed. I find that all the entries in Calendar are doubled up; the times for each are the same, but every entry is duplicated.

I am not sure that coming back from a different time zone is actually the cause of the problem, but it may be.

How can I resolve this?

Hi and welcome to the Forum!

Have a look at this link for your calendar problem, I hope it helps you.
? How to Delete Duplicate Events in Calendar?

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