Day of the week
calculator
What day of the week were you born? What day does that date land on next year? Pick any date, past or future, and get the weekday instantly — with how long ago or ahead it is.
Why weekdays drift year to year
A common year holds 365 days — exactly 52 weeks plus one day. So every date slides one weekday forward each year, and two when a leap day (February 29) falls in between. Your birthday marches Monday, Tuesday, Wednesday… skipping a step after leap years.
366 (leap) → +2 · the full cycle repeats every 28 years
How the calculator knows
It uses the calendar's arithmetic directly (the same rules as Zeller's congruence): the Gregorian calendar is perfectly periodic, so any date maps to a weekday with no lookup tables. Dates before a country adopted the Gregorian calendar (1582 in Catholic Europe, 1752 in Britain and its colonies) were recorded in the Julian calendar — this tool answers in Gregorian terms throughout.
For the distance between two dates rather than the weekday, the date difference calculator is the partner tool, and age handles the birthday math.
Day of the week FAQ
Pick your birth date above — the weekday appears instantly. June 15, 1990, for example, was a Friday.
A year is 52 weeks plus one day, so every date shifts one weekday forward annually — two when a leap day falls in between. The full pattern repeats every 28 years.
Arbitrarily far in Gregorian terms. Just note that dates before Gregorian adoption (1582–1752 depending on country) were originally recorded in the Julian calendar, which differs by several days.
The weekday is computed from the calendar date itself, not a moment in time, so timezones don't affect the answer.