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I'm writing documentation for a computer script I wrote. I'm wondering which I should say:

  1. The script should run at the 1st of every month.

  2. The script should run on the 1st of every month.

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deano
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    *On* is used with specific days and dates, *at* with times, *in* with timespans (centuries, years, months) – StoneyB on hiatus Apr 08 '14 at 18:14
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    I believe [this question](http://ell.stackexchange.com/questions/12/dates-and-times-on-in-at) provides the answer you seek. “At” would be used for an exact time (8:30 am on that day, for example), “on” is used when referring to the day in general (as in your case). – Tyler James Young Apr 08 '14 at 18:15
  • @Tyler - That said, we'd use _at_ for a more general day, too: "The script should run at the beginning of every month." – J.R. Apr 08 '14 at 21:28

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