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Week numbers

You learn to work with week numbers: which week is a date in, and on which date does a week start?

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How to work it out

  1. A week starts on Monday and ends on Sunday.
  2. Find the week you already know.
  3. Then count on or back in sevens: each time it is one week more or one week less.

Week 19 starts on Monday 5 May. Which week is Thursday 22 May in?

  1. A week starts on Monday and lasts 7 days.
  2. Week 20 starts 7 days later, on 12 May.
  3. Week 21 starts another 7 days later, on 19 May.
  4. 22 May is between 19 and 25 May.
  5. So week 21.
More examples

Week 19 starts on 5 May. On which date does week 22 start?

  1. Three weeks later: 3 × 7 = 21 days.
  2. 5 + 21 = 26 May.

Week 19 starts on 5 May. Which week is 2 May in?

2 May is before 5 May, so it is in the week before: week 18.