Day of the Week Calculator
Find what weekday any past or future date falls on.
What day was that?
Every date falls on a weekday, but working it out in your head for a random year is hard. Enter any date and this tool names the weekday instantly, along with whether it is a weekend.
It also shows which numbered day of the year the date is — useful for planning, logging, and quick trivia like what day a birthday or holiday will land on next.
Instant and private
It reads the weekday straight from the date in your browser, so nothing you enter is uploaded.
Frequently Asked Questions
What does it tell me?
The day of the week for any date, whether it is a weekend, and which numbered day of the year it is.
Does it work for old dates?
Yes, for any date the browser can represent, spanning centuries in either direction using the proleptic Gregorian calendar.
Why would I need this?
To check what day you were born, plan around a future weekday, or settle a which-day-was-it question.
Browse the full set of free, private, in-browser tools.