Day of Week Calculator
Day of week calculator
Find weekday name for any date.
Result
Sunday
Weekday is resolved using Gregorian calendar rules.
Formula
Weekday derived from Gregorian date modulo 7 cycle Symbol legend
| Symbol | Meaning | Unit | Copy |
|---|---|---|---|
w | Weekday index | 0 to 6 | |
d | Absolute day number | days |
- Map date into a Gregorian day index.
- Apply modulo seven cycle.
- Resolve index to weekday name.
Example
Worked example: 2026-06-06
- 1 Input date is parsed
- 2 Week cycle index is resolved
- 3 Weekday returned as Saturday
Date 2026-06-06 falls on Saturday.
How
- Select a date from the picker.
- Run the calculator instantly.
- Read weekday name result.
Avoid
- Entering invalid date format manually.
- Assuming locale-specific weekday numbering.
- Confusing weekday with ISO week number.
Checks
Best fit
Day of Week Calculator is built for find weekday name for any date to support planning and historical checks. If Day of Week Calculator does not match the input scope, compare the answer with a second method.
Input check
Check w before calculating: it means weekday index and is measured in 0 to 6.
Sanity check
For Day of Week Calculator, use the worked example as a quick benchmark: Date 2026-06-06 falls on Saturday. If the day of week calculator answer is far away, check whether an input, unit, or mode changed.
Before copying
Review this common issue first: entering invalid date format manually.
FAQ
Can this check past dates?
Yes, historical and future dates are both supported.
Does timezone affect weekday result?
This date-based tool uses calendar date values directly.
Can weekday and week number differ by locale?
Yes, this tool uses standard Gregorian weekday naming and ISO week conventions separately.
Switch
Switch12
No match.