When writing dates in prose in the dmy format (29 March 2014), is the correct preposition "in" or "on". I'm seeing it with "in" here, but that construction is foreign to me.

It was released in 29 March 2010 on Steam for Microsoft Windows, and in 25 March 2010 on Xbox Live Indie Games for the Xbox 360.

"On" would seem to make more sense, from what I know. Verdict?

1 Answer 1


On is the only correct preposition here. In is not used to indicate a specific date, no matter what the format.

If you look at the edit history of the Wikipedia page, though, you’ll see that there was originally no date. It originally read:

It was released in February 2010 for Microsoft Windows, and in March 2010 for Xbox Live.

Since this is not a specific date, but rather a period of time, in (meaning ‘during the course of’) is the correct preposition in the original text.

Someone later added the dates and forgot to change the preposition. The user who added the dates speaks Spanish as his first language, a language that makes a similar distinction; so it almost has to be an oversight. No other changes were made in the edit that introduced the dates, so it was probably just a quick’n’dirty fix.

  • The edit in question being this one, and by a non-native speaker from Venezuela, mind you.
    – RegDwigнt
    Commented Mar 29, 2014 at 17:10
  • Jinx, @RegDwigнt! Was just addressing that as you were typing. Spanish would make a similar distinction (en febrero for the month but simply el 26 de febrero with no preposition for the date), so I don’t think the non-nativeness plays a big part here. Commented Mar 29, 2014 at 17:13
  • Yeah, just saying. (Plus I do speak some Spanish, so that wasn't quite my point; whether or not Spanish makes the distinction is a red herring because that says nothing about whether English makes it. In other words, as a non-native speaker I might well think that English uses in for everything, regardless of what my mother tongue does. I would guess you are right, but it's hard to be sure short of asking Hahc21.)
    – RegDwigнt
    Commented Mar 29, 2014 at 17:23
  • @RegDwigнt, true … but I’d say a more logical and common approach if you don’t know for sure how a foreign language does something would be to assume that it does it the same way as your own language, rather than in some other way. :-) Commented Mar 29, 2014 at 17:32
  • Something was wrong on the Internet, but I have just fixed it. ;-) Commented Mar 30, 2014 at 2:34

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