Feature suggestion: Allow relative dates

[wamatt]

Firstly, thank you for a fantastic tool. :)

Anyways this proposed feature would allow one to specify a relative time, eg "2 Months Ago" which would be a rolling window. That way additional client side logic is not needed if you run the task periodically and only want to process newish mails for performance reasons.

[jamesridgway]

Please feel free to create a pull request to add this feature.

[KottV]

It can be achieved by inserting command output as argument:

--date-after=`date -d '1 hour ago' -I'seconds'`

thank you for a great tool!

[github-actions[bot]]

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