Day of Week Calculator
Weekday, ISO weekday (Monday = 1), day of year, and leap-year flag.
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How to use Day of Week Calculator
- Enter date. Leave a field blank only when the page says the value is missing, not by typing 0 unless 0 is a real value.
- Read the result rows under the form. Errors appear in the status line. Nothing is uploaded.
- Use today fills the as-of or start date using this browser’s local calendar.
Day of Week Calculator
Weekday
| Computes | Weekday, ISO weekday (Monday = 1), day of year, and leap-year flag. |
|---|---|
| Includes | Weekday |
| Includes | Day of year |
| Includes | Leap year |
| Engine | dateDiff |
| Upload | None |
| Advice | Arithmetic only |
What Day of Week Calculator is
Gregorian calendar in this browser's local date, no time of day. Leap years are the usual 4/100/400 rule.
The formula runs in this tab. CZNull does not receive the numbers.
How this page computes
ISO week numbers are week number. Age from a birth date is age.
Entities and related jobs
Weekday, ISO weekday (Monday = 1), day of year, and leap-year flag. Named features: Weekday, Day of year, Leap year.
See also Week Number Calculator, Year Calendar, Add or Subtract Days, Date Difference Calculator, Age Calculator, Business Days Calculator.
Use cases
Planning a meeting on a given calendar date. Zeller-style curiosity is not required; the device calendar is used.
Limits
Invalid input appears in the status line. IEEE floating point applies unless a row says otherwise. CZNull does not receive the numbers.