One May day

Your sentence is very nice.

I might also suggest something like:

One day in May, I took a trip to Paris.

I took a one-day/ three-day/ one-week trip to Paris in May.

In May, I visited Paris for a day/ three days/ a week.

It might be helpful not to say "went for a trip."

I guess it's ok if you're referring to May Day the holiday. Otherwise I'd use

one day in May.

No, I meant a plain ordinary day in May, or any other month. I'm not sure if it sounds idiomatic in English and I know I can say One day in May. I'm just interested in the very phrase One May/September/December day. Do you native speakers use it?

If you say "One September Day," that is, of course, "good" English. In fact, I think there's a song by that title.

But I don't think native speakers use "One (month) day" very often.

They DO, however, use "One (season) day" quite often: One beautiful spring day, I. ..../ One summer day, the sun was. ....

AnonymousBut I don't think native speakers use "One (month) day" very often.

That's what I'd like to know. If it's idiomatic or not for native speakers. Anybody?

One day in May, I went ON a trip to Paris.
One May day, I went ON a trip to Paris.

Both are fine.

You would have to live quite close to Paris to visit for one day though.

Thank you, GG! I'll try to get accustomed to the second version.

Grammar GeekYou would have to live quite close to Paris to visit for one day though.

Not necessarily. I heard that those modern trains can take you from London to Paris in only about two and a half hours. However, one day may be not enough to explore Paris properly.

Compared to Philadelphia or Jakarta, London is pretty close to Paris!

I can take a trip to New York City for the day. Alas,

Compared to New York City, why would anyone go to Paris!

(No offence, Frenchmen)

Something to do with chocolate croissants, perhaps?