# 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

• see this answer ux.stackexchange.com/questions/110281/… – Devin Aug 22 '17 at 18:11
• @Devin Good information, however, selecting and displaying has a different workflow. – user1032531 Aug 22 '17 at 18:19
• that's why I didn't add it as an answer ot even marked teh question as duplicate, it's to give you ideas of different caveats we had found by research :) – Devin Aug 22 '17 at 19:15

### Less Ambiguous:

The first full week of July

That would be less ambiguous, though you'd still potentially confuse people if the 1st of the month is on a Monday... Cultures differ in if Sunday or Monday is the start of the week.

### Unambiguous:

The first full week of July (2nd—9th).

This explicitly provides the dates mentioned in the range. Also, this helps the user by providing the dates explicitly so they don't need to reference a calendar if they know the date they have in mind. For example,

I know this event happened June 8th... Was that the first or second week of June?

• Thanks maxathousand, Agree adding ranges increases clarity, but it also uses real estate. – user1032531 Aug 22 '17 at 18:08