Day of the Week Calculator

Find what day of the week any date was or will be.

By the PunchClockCalc team · Last updated

To find the day of the week for a date, count the days from a date whose weekday you know and divide by 7; the remainder tells you how many weekdays to move. For example, July 4, 1776 was a Thursday and Christmas 2026 is a Friday. The calculator works for any year from 1 to 9999.

Day of the week–
Day of the year–
Today is–

How do I use the day of the week calculator?

  1. Enter a date in the past or future, or click Today.
  2. Read the weekday, whether it is a weekend, which occurrence of that weekday it is in the month (for example the 4th Thursday), and the day of the year.
  3. Compare with today: the result also says how many days ago or from now the date is.

How is the day of the week calculated?

The Gregorian calendar repeats every 400 years, and those 400 years contain exactly 20,871 weeks. That makes weekdays predictable: the calculator turns the date into a count of days from a fixed starting point, divides by 7, and the remainder is the weekday. Leap years are included, which is why a date usually moves one weekday later each year, but two weekdays after February 29.

A quick check without a calculator: your birthday falls one weekday later each year, or two if a February 29 comes between. If November 3 is a Tuesday in 2026, it is a Wednesday in 2027 and a Friday in 2028.

Worked examples

Example 1: a historical date

The Declaration of Independence was adopted on July 4, 1776, a Thursday, day 186 of a leap year.

Example 2: a future holiday

Christmas 2026, December 25, is a Friday, so the federal holiday is observed on the day itself and many workers get a three-day weekend.

Example 3: a leap day

February 29, 2028 is a Tuesday, the 5th Tuesday of February and day 60 of 2028.

What day of the week are the major holidays?

Weekday of New Year's Day, July 4, Halloween and Christmas 2026 to 2030
YearJan 1July 4Oct 31Dec 25
2026ThursdaySaturdaySaturdayFriday
2027FridaySundaySundaySaturday
2028SaturdayTuesdayTuesdayMonday
2029MondayWednesdayWednesdayTuesday
2030TuesdayThursdayThursdayWednesday

When a federal holiday falls on a Saturday it is usually observed on the Friday before, and on a Sunday the Monday after. The business days calculator applies those rules when counting working days, and the week number calculator shows which week a date falls in.

Frequently asked questions

What day of the week was I born?

Enter your date of birth above. The age calculator also shows the weekday you were born along with your exact age.

Does the calculator work for old dates?

Yes, for any year from 1 to 9999, using the Gregorian calendar extended backwards. Britain and its colonies switched from the Julian calendar in 1752 and many other countries switched at different times, so dates from before the switch may differ from what was written at the time.

How can I work out the weekday in my head?

Use the Doomsday rule: in any year, 4/4, 6/6, 8/8, 10/10, 12/12, 5/9 and 9/5 share the same weekday. In 2026 that day is a Saturday, so October 10, 2026 is a Saturday, and October 31 (21 days later) is too.

How do I get the day of the week in Excel?

Use =TEXT(A1,"dddd") for the name, or =WEEKDAY(A1) for a number from 1 (Sunday) to 7 (Saturday).

Does the weekday depend on my time zone?

No. A calendar date always has the same weekday everywhere. Only “today” depends on where you are, because people in different time zones can be on different dates.

More free date & time tools

Date CalculatorDays between two dates, or add and subtract days, weeks, months and years.Business Days CalculatorWorking days between dates, minus weekends and U.S. federal holidays; add business days.Days Until CalculatorCountdown to Christmas, New Year, Thanksgiving or any date.Age CalculatorExact age in years, months and days, and days to your next birthday.Time Card CalculatorWeekly hours, lunch breaks, overtime and pay.Military Time Converter24-hour ⇄ 12-hour conversion and full chart.