AD - DAy's off

[Puppet]

Hello,

If the one works at a company and he used to show up during the public holidays. there, the labor law gives him the right to get a day's off later on.

1- What do we call these replaced days in the standard english?
Is there any common term for it?

2- And when can the one use "AD" as a short of alternate days..
in comparing with what am I asking about ?

[Beeesneees]

1. He would be given a day in lieu (of the public holiday). I can't think of a more specific name for it.

2. I've never heard the term used.
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Cheers m' dears!

[Puppet]

Thank you Beee,

Then it's a day in lieu. Yes that what I was looking for.
I've googled and found also "time off lieu" & "in lieu days".

Concerning "AD", I've read it on this url; http://acronyms.thefreedictionary.com/Alternate+Days