dinner on Christmas vs. dinner in Christmas

[Valery]

English Grammar Tests, Elementary Level

ESL/EFL Test #96 "prepositions of time: for, ago, since, on, at", question 7

We always eat a roast dinner ......... Christmas day.

(a) in
(b) on
(c) at
(d) since

English Grammar Tests, Elementary Level

ESL/EFL Test #96 "prepositions of time: for, ago, since, on, at", answer 7

We always eat a roast dinner on Christmas day.

Correct answer: (b) on

Your answer was: incorrect
We always eat a roast dinner in Christmas day.
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Can I say in Christmas?

Valery

[Conchita]

No, but you can sat 'at Christmas' (meaning 'Christmas time').

'In' is not the right preposition for a day or date. 'In' can be used for parts of the day (in the morning/afternoon/evening, for example), as well as for months and years (in March, in 2007).