makeatimerDates
Weekday finder
Find which day of the week a date falls on, with its day of the year.
Inputs
Result
2026-09-29 · day 272 of 365
How to use weekday finder
Check the weekday of a birthday, appointment, or historical date. The result also shows its position within the year so you can check a schedule quickly.
Worked example
September 29, 2026 is a Tuesday and the 272nd day of a 365-day year.
What the result means
Calculations use the ISO Gregorian calendar for years 0001–9999; historical local calendar adoption is not modeled.
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