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Quick Answer
What is Monday − 73 days?
These sentences all describe the same result:
If today is Monday, 73 days before was Friday
73 days before Monday is Friday
Monday − 73 days = Friday
The weekday 73 days before Monday is Friday
Detailed Math (Step-by-Step)
We show the whole operation clearly (modulo 7).
Step 1: Find the remainder
Since weekdays repeat every 7 days: days mod 7 tells us how many steps to move backward.
| Days | 73 |
|---|---|
| Divide by 7 | 10 remainder 3 |
| Remainder | 3 |
Step 2: Move backward 3 day(s)
Start at Monday and count backward 3 step(s).
| Step | Weekday |
|---|---|
| 0 | Monday (start) |
| 1 | Sunday |
| 2 | Saturday |
| 3 | Friday (result) |
Quick Lookup Table
Common values going backward from Monday.
| Days before Monday | Weekday | Remainder (mod 7) |
|---|---|---|
| 0 | Monday | 0 |
| 1 | Sunday | 1 |
| 2 | Saturday | 2 |
| 3 | Friday | 3 |
| 4 | Thursday | 4 |
| 5 | Wednesday | 5 |
| 6 | Tuesday | 6 |
| 7 | Monday | 0 |
| 8 | Sunday | 1 |
| 9 | Saturday | 2 |
| 10 | Friday | 3 |
| 14 | Monday | 0 |
| 21 | Monday | 0 |
| 28 | Monday | 0 |
| 30 | Saturday | 2 |
| 73 | Friday | 3 |
Tip: Any number of days that differs by a multiple of 7 lands on the same weekday.
Instant Calculator
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More “Weekday Before” Examples
Check other weekday calculations going backward in time.