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If today is Sunday, what day was it 63 days before?

Answer: Sunday

Weekdays repeat every 7 days. So we only need the remainder after dividing 63 by 7, then move backward that many days from Sunday.

Quick rule:
remainder = 63 mod 7 = 0
move backward 0 day(s) from Sunday
→ Sunday

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Quick Answer

These sentences all describe the same result:

If today is Sunday, 63 days before was Sunday
63 days before Sunday is Sunday
Sunday − 63 days = Sunday
The weekday 63 days before Sunday is Sunday

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We show the whole operation clearly (modulo 7).

Since weekdays repeat every 7 days: days mod 7 tells us how many steps to move backward.

Meaning: Jump whole weeks first (they don’t change the weekday), then move the remainder days backward.

Start at Sunday and count backward 0 step(s).

Step	Weekday
0	Sunday (start) (result)

Final: Sunday − 63 days = Sunday

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Common values going backward from Sunday.

Tip: Any number of days that differs by a multiple of 7 lands on the same weekday.

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Change weekday and day count to see the result immediately.

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Check other weekday calculations going backward in time.