Enter a date of birth and this tool tells you which day of the week it fell on — a detail nobody remembers about their own birth but that always draws a reaction — along with a countdown to the next birthday and which day of the week that will land on this time round.
The day-of-week calculation runs on the same underlying calendar logic used for scheduling and rostering, just applied backwards to a historical date rather than forwards. It's a common one for milestone birthdays, where people like to know whether a big one falls on a weekend or a weekday.
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