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Quick Answer
What is Wednesday − 13 days?
These sentences all describe the same result:
If today is Wednesday, 13 days before was Thursday
13 days before Wednesday is Thursday
Wednesday − 13 days = Thursday
The weekday 13 days before Wednesday is Thursday
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 | 13 |
|---|---|
| Divide by 7 | 1 remainder 6 |
| Remainder | 6 |
Step 2: Move backward 6 day(s)
Start at Wednesday and count backward 6 step(s).
| Step | Weekday |
|---|---|
| 0 | Wednesday (start) |
| 1 | Tuesday |
| 2 | Monday |
| 3 | Sunday |
| 4 | Saturday |
| 5 | Friday |
| 6 | Thursday (result) |
Quick Lookup Table
Common values going backward from Wednesday.
| Days before Wednesday | Weekday | Remainder (mod 7) |
|---|---|---|
| 0 | Wednesday | 0 |
| 1 | Tuesday | 1 |
| 2 | Monday | 2 |
| 3 | Sunday | 3 |
| 4 | Saturday | 4 |
| 5 | Friday | 5 |
| 6 | Thursday | 6 |
| 7 | Wednesday | 0 |
| 8 | Tuesday | 1 |
| 9 | Monday | 2 |
| 10 | Sunday | 3 |
| 13 | Thursday | 6 |
| 14 | Wednesday | 0 |
| 21 | Wednesday | 0 |
| 28 | Wednesday | 0 |
| 30 | Monday | 2 |
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.