1
  • on September 29 2014
  • in September 29 2014

I know with months, we should use in, and with days, we should use on. However I find the American way in writing the month before the day in dates to be confusing. Should we use on here because we are referring to a day or should we use in because it immediately precedes a month? On seems more appropriate to me here, but since I am not a native speaker I thought I should ask.

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'On' always precedes dates.

For example:

  • An event took place on the twenty ninth of September, 2014.
  • An event took place on September the twenty ninth, 2014.
  • An event took place on 29th September, 2014.
  • An event took place on September 29th, 2014.
  • An event took place on 29 September, 2014.
  • An event took place on September 29, 2014.
  • An event took place on 2014/09/29.

Thumb rules:

in + month or year- In March, In 2003

on + date (with the year or without it) or day of the week- On April 2, On March 3, 1999, On Saturday

at + clock time, midnight, noon- At 3:30 p.m., At 4:01, At noon

in + season- In the summer, In the winter

in + morning, afternoon, evening- In the morning, In the evening

at + night- At night

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