When does the first week of a given month start?

I wish to display a bar chart showing weekly revenues per month. A week is defined 12:00 AM Sunday to 11:59 PM Saturday, and I want to display full week values (i.e. not just revenues for 7/1 for first week of July). When would most people feel the first week of a given month starts and the last week ends? Several options are:

First week starts when any day of given month falls in that week:

  • July Week 1 from 6/25 to 7/1
  • July Week 2 from 7/2 to 7/8
  • July Week 3 from 7/9 to 7/15
  • July Week 4 from 7/16 to 7/22
  • July Week 5 from 7/23 to 7/29
  • July 30th and 31st are part of August and not part of this month.

First week starts when all days of given the month falls in that week:

  • July 1st is part of June and not part of this month.
  • July Week 1 from 7/2 to 7/8
  • July Week 2 from 7/9 to 7/15
  • July Week 3 from 7/16 to 7/22
  • July Week 4 from 7/23 to 7/29
  • July Week 5 from 7/30 to 8/5

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