Tomorrow is my day off? or Tomorrow is my off day?

[Lucci]

Is this correct?

Tomorrow is my day off?
or

Tomorrow is my off day?

The situation is that i don't have to work tomorrow. I want to use day off ... thanks

[Kitosdad]

Either can be used, but the first is more commonly used.
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Keep it simple ... Keep it interesting.

[Jim Jim]

Use the first.
an "off day" can be a day when you're not quite right. Jim is having an off day, today.

"day off" as a phrase means a day when you're away from work

[Hieupt]

... just be noted that the plural form of "day off" is "days off"...

Ex: I'll take some days off before my wedding.
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Thank you very much,
Hieu Phan.

P/s: Please just correct if I'm wrong somewhere!