What day of the week? (date → day)
Pick a date, past or future. Gregorian calendar.
Result
SaturdayDay of the week
- Full date
- Saturday, October 10, 2026
- ISO week 41 of 2026.
- Day 283 of 365 in the year.
- Quarter 4.
- 2026 is not a leap year (365 days).
Inputs
- Date
- 2026-10-10
How it is calculated
Days are counted from a reference date in the Gregorian calendar, then the remainder after dividing by 7 gives the weekday.
Result
Day of the week
- Full date
- Saturday, October 10, 2026
How it is calculated
- Days are counted from a reference date in the Gregorian calendar, then the remainder after dividing by 7 gives the weekday.
- ISO 8601 week: weeks start on Monday; week 1 is the one holding the first Thursday of January.
- Leap year: divisible by 4, except centuries not divisible by 400 (1900 no, 2000 yes).
Example
October 10, 2026 is a Saturday: ISO week 41, day 283 of 365, quarter 4.
Good to know
- Gregorian calendar extended before 1582: historical dates in the Julian calendar may differ.
- Some countries number weeks differently (weeks starting on Sunday).
When to use it
- Find the weekday for a past or future date and check its ISO week number.
Frequently asked questions
Which calendar does this tool use?
It uses the Gregorian calendar, extended to dates before its historical adoption.
How is the ISO week number determined?
Weeks start on Monday, and week 1 is the week containing January’s first Thursday.
How can I tell whether a year is a leap year?
A year divisible by 4 is a leap year, except century years that are not divisible by 400.