What would be the correct usage to refer of a timesheet that was due on a previous pay period?

'...pay period ending on 5/01/2016'


'...pay period ending in 5/01/2016'.

I struggle a lot with in/on usage. I would appreciate some didactic knowledge in the correct usage for 'on/in' in your answer.

  • See the dictionary entry for "on". Compare with the dictionary entry for "end in". – michael.hor257k May 15 '17 at 15:39
  • You know how to use a dictionary. – Nell Martinez May 15 '17 at 15:49
  • Also it's usually "refer to," not "refer on." – Xanne May 15 '17 at 16:32
  • A pay period would end on a specific date or it might fall on a day in a period of time (month, quarter, week, etc.). e.g., I get paid on the first Friday in June and it usually posts to my account in the afternoon. – Roger Sinasohn May 15 '17 at 17:45

Time periods generally begin and end on a day, or in a month or a year. So "ending on 5/01/2016" is correct.

In some contexts, particularly US and Business English, the more succinct "ending 5/01/2016" is also quite common. In British English, it's less common to omit the "on".

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