student asking question

Is there any difference in "on a cold day" and "in a cold day"?

teacher

Native speaker’s answer

Rebecca

Yes, there is a difference between "on a cold day" and "in a cold day". The preposition "in" is not generally used when referring to a specific day, and so "in a cold day" sounds a little unnatural. However, it is common to use the preposition "on" when referring to a day, so the phrase "on a cold day" sounds natural. Ex: I first met him on a hot day last summer. Ex: Let's go to the beach on a day when it's sunny.

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