When I'd like to specify dates to do some task, how can I express that the last date should be included in the provided period?
From 5th to 7th March
Meaning March 5th, March 6th and March 7th.
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The least ambiguous would be to use "up to and including":
From the 5th up to and including the 7th of March
Using through works as well:
From the 5th through the 7th of March
since that word means
4 c : to and including
// Monday through Friday
(source: Merriam Webster)