Counting 21 days?

Lucy_Dobinson

Songster
Apr 6, 2020
69
84
121
Sorry this seems like a stupid question, but how do people calculate the 21 day gestation? I put some eggs in at 11am on the 23rd August. So would I put them into lockdown on day 18 - 11am 11th September? And they would be due 14th September day?
 

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