Find the weekday for any date and preview future weekday patterns.
This tool provides estimates for informational purposes only and is not a substitute for professional advice. Individual results vary based on personal circumstances and assumptions.
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Have you ever wanted to know what day of the week a specific date fell on — your birthday in 1985, a famous historical event, or a date that a document references? This day of the week calculator gives you the answer instantly for any date in history or the future. It also shows a weekly preview of upcoming dates, making it useful for planning recurring events, identifying weekends, and understanding calendar patterns.
Computers find this trivial, but it can also be calculated by hand using an algorithm called Zeller's Congruence or the Doomsday algorithm, developed by mathematician John Conway. The Doomsday method works by identifying that certain "anchor" dates always fall on the same weekday in any given year.
For most practical purposes, the calculator above is the fastest approach. Enter any date and the day of the week is shown instantly, along with the day's position in the week and a weekday distribution chart for the surrounding period.
Some of history's most significant events are known by their date but not always by their weekday. Here are notable examples:
In the Gregorian calendar, dates don't cycle uniformly through weekdays. Over a 400-year cycle, certain days of the week are slightly more or less common for specific dates. The calendar repeats exactly every 400 years (the Gregorian cycle), but within that the distribution is slightly uneven:
For practical purposes, calendars repeat approximately every 6 or 11 years (depending on leap year alignment), and exactly every 28 years for a non-century year. If you have a calendar from 1996, it is valid again in 2024 (28 years later, same weekday-date pattern).
Many cultures attach meaning to the day of the week you were born. The traditional English nursery rhyme "Monday's Child" describes personality traits for each birth weekday: "Monday's child is fair of face, Tuesday's child is full of grace, Wednesday's child is full of woe, Thursday's child has far to go, Friday's child is loving and giving, Saturday's child works hard for a living, but the child born on the Sabbath day is bonny and blithe and good and gay." Enter your birthdate to find your day.
In the US, the most common day for births is Tuesday, with Wednesday and Thursday close behind. Saturday has the fewest births, largely because elective C-sections and inductions are less common on weekends. Birth statistics vary by country but the weekday effect is consistently observed in hospital data.
Beyond historical curiosity, knowing the day of the week for a future date is essential for planning:
Friday is disproportionately associated with significant events:
Enter your date of birth in the calculator above to find out instantly. Many people are surprised — most do not know their birth weekday.
No. Each calendar year, any given date moves forward by one day of the week (or two days after a leap year). So if your birthday is on Monday this year, it will be on Tuesday next year (or Wednesday if this year is a leap year and your birthday is after February 29).
Enter December 25 of the current year in the calculator to find out. Christmas moves one day forward each standard year and two days forward after a leap year.
Yes, statistically. In the Gregorian 400-year calendar cycle, the 13th of any month falls on Friday slightly more often than any other weekday. It is more common than, for example, a Thursday the 13th or a Sunday the 13th.
Note: Results use the Gregorian calendar system. For dates before the Gregorian calendar was adopted (October 1582 in most Catholic countries, later in Protestant countries), historical dates may differ from what is shown.