What Day of the Week Is It?
What day of the week is it?
Today is Sunday, Sunday, October 4, 2026. Tomorrow is Monday, and 100 days from now is Tuesday, January 12, 2027. Enter any date to find its weekday, or open a ready-made page for a calendar date such as January 1.
How weekday lookups work
The weekday of any date follows from the count of days since a known reference date, taken modulo seven. The calculator applies that rule to real calendar dates, including leap days, so it works for the past and the future alike.
Why people look up weekdays
Birthdays, anniversaries, deadlines and event dates are easier to plan once you know the weekday. Historians, genealogists and lawyers also need to know whether a date fell on a weekend or a weekday.
Related lookups
Each result page shows the day of the year, ISO week, quarter and weekday for the selected date.
Frequently asked questions
How do I find the day of the week for a date?
Enter the date in the box above and the calculator shows the weekday.
Can it find the weekday for past dates?
Yes, any date from 1900 to 2200 works.
Does it handle leap years?
Yes.
What is the day of the year?
The result page shows how many days into the year the date falls.
What is the ISO week number?
The result page shows the ISO-8601 week, which starts on Monday.
Is today a weekday?
Today is Sunday.
Can I look up a date like March 3?
Yes, use the month-and-day pages in the list below.
Which calendar is used?
The Gregorian calendar.