What Day of the Week Was That?
Pick any date — past or future — and see instantly which weekday it was or will be.
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How to use it
Pick a date. Your birthday, a wedding, a deadline — any date at all.
Get the weekday. Instantly, plus how many days ago or from now it is.
That's it. No account, no maths, no calendar app archaeology.
The calendar behind the answer
The Gregorian calendar repeats its weekday pattern on a 400-year cycle, which is why a pocket calculator can answer "what day was 3 October 1998?" (a Saturday) without looking anything up. This tool does the same arithmetic your phone's calendar app does — no lookup table, no guesswork. One honest caveat: for dates before October 1582 it shows the proleptic Gregorian date, which is what modern software uses but not what people wrote on their letters at the time.