Day of the Week Calculator

Day of the Week Calculator tells you exactly which day of the week any date falls on — instantly, beautifully, and completely offline. Pick a date from the distant past or far into the future and read off the weekday, plus a handful of useful calendar facts.

Whether you are checking the day you were born, planning an event, settling a bet, or just curious about a historic date, this little tool gives you a clear answer in a tap.

WHAT YOU CAN DO
• Find the weekday for ANY date — centuries back or years ahead
• See the day of the year (1–366) and the ISO-8601 week number
• Know at a glance whether a date is a weekend or in a leap year
• See how many days a date is from today
• Load famous dates with a single tap, straight into the calculator

THREE SIMPLE TABS
• Calculate — a clean tear-off calendar shows the day, date and key facts
• Learn — short, plain-language explanations of weekday cycles, leap years and ISO weeks
• Examples — historic dates (the Moon landing, the fall of the Berlin Wall and more) you can load instantly

WHY YOU'LL LIKE IT
• Beautifully designed, with a thoughtful light AND dark theme
• Fast and lightweight — a tiny download
• Works fully OFFLINE; no account, no sign-in
• No clutter, no confusing options — just the answer you came for

PRIVACY
The app does not collect personal data and needs no special permissions to do its job. It works without an internet connection. Ads are served by Google AdMob, which may use an advertising identifier as described in Google's policies.

ACCURACY
All results use the proleptic Gregorian calendar, so the same rules apply consistently to dates far in the past and future. Results may differ from regional or historical calendars; please verify important dates with an official source.

Download Day of the Week Calculator and never wonder "what day was that?" again.