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- Instructions for finding the day of the week on which a date occured:
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- To find the day of the week on which a day in the 20th century occured, follow this procedure:
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- 1. Take the last two digits of the year:______
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- 2. Divide the answer above by 4 and discard the remainder if any:________
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- 3. Find the number associated with the month in the table of months below:_______
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- 4. Sum the answers to the first three steps then add the number for the day of the month.
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- 5. Find the remainder when the answer to step 4 is divided by 7. Look this number up in the Table of Days to find the day of the week.
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- Table of Months: Table of Days:
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- January: 1 (0 in leap year) Sunday: 1
- February: 4 (3 in leap year) Monday: 2
- March: 4 Tuesday: 3
- April: 0 Wednesday: 4
- May: 2 Thursday: 5
- June: 5 Friday: 6
- July 0 Saturday: 0
- August: 3
- September: 6
- October: 1
- November: 4
- December: 6
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- Example: 22 September, 1969
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- Step 1: 69
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- Step 2: 69/4 = 17 (fractional part is discarded)
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- Step 3: September -> 6 in the Table of Months
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- Step 4: 69 + 17 + 6 + 22 = 114
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- Step 5: 114/7 = 13 with a remainder of 2 so, after looking at the Table of Days, we know that 22 September, 1969 was a Monday.
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