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I want to put a variation of the following just above a company description, but I'm wondering which preposition I should use:

Business Founded On December 2011
Business Founded In December 2011

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...I am not sure which sentence is which... – Phonics The Hedgehog Oct 28 '11 at 2:36
It's in December 2011, or on December 25th 2011. Choice of preposition depends on whether it's on a specific day, or in some extended timeframe such as a month, season, or year. The standard wording is Established 2011 (it's unusual to specify the month or date thereof). – FumbleFingers Oct 28 '11 at 2:42
Welcome to English Language and Usage! I just wanted to let you know I've made a few edits to your question for clarity and formatting; in the future, if you could try to be a little more precise with your titles, that would be great! And please let me know if you have any questions about the site. – waiwai933 Oct 28 '11 at 2:46
Great, thanks for the tips! – Joe Oct 28 '11 at 3:18

Continuing my proud tradition of taking credit for something that FumbleFingers already answered in the comments...

Short Version: In would be appropriate here, On would be appropriate if you were specifying an exact day.

Long version: Using these definitions...

In - used to indicate inclusion within space, a place, or limits

On - so as to be attached to or unified with

...we can think of specifying month only as telling us the founding date is including within the limits of the month, while specifying a day tells us that the founding date is attached to that specific day.

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