Friends, how to make a diminutive form of the word day? As an example of a sunny day
Как сказать на английском " солнечный денек" ?

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'Heatwave' if there are sunny days for a few days. I don't think there is a single word for a sunny day.

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Do you mean in English? I am confused because your headline is in English but your post is in another language!

In Englsh, the word "day" does not have a diminutive. In fact, very few English words have a diminutive form!