Day of the Week Calculator.

Find what day of the week any date falls on — past, present or future — in your own language.

On-device calculationNo signup

Set your values

Results update as you type.

02 / ANSWER

How to Use

Weekday names are generated for your selected language automatically. The calculator uses the proleptic Gregorian calendar, the same calendar JavaScript and most software use, so results match spreadsheet and database date functions.

FAQs

What day of the week was I born on?

Enter your date of birth into the date field and the calculator shows the weekday immediately, along with the ISO weekday number and whether it was a weekend.

What is the ISO weekday number?

ISO-8601 numbers weekdays Monday = 1 through Sunday = 7. JavaScript and many spreadsheets instead use Sunday = 0 through Saturday = 6. This calculator shows both so you can match whichever system your software uses.

Does the calculator work for dates before 1900?

Yes. It handles dates before 1970 and even years below 100 correctly. It uses the proleptic Gregorian calendar, so results match standard software date functions rather than the Julian calendar historically used before 1582.

Will the weekday name show in my language?

Yes. The weekday name is generated from your selected site language using the browser's internationalization support, so it appears in your own language and script rather than always in English.

Which dates count as the weekend?

This calculator labels Saturday and Sunday as the weekend, the most common convention. Some countries use Friday-Saturday or a different pairing, so adjust for your local working week.

Related Calculators

12 Hour to 24 Hour Time ConverterConvert between 12-hour AM/PM time and 24-hour military time in both directions.Add or Subtract Time CalculatorAdd or subtract hours, minutes and seconds from a start time, with midnight rollover.Age CalculatorCalculate exact age in years, months, days Age in Days CalculatorCalculate your exact age in total days, weeks, hours — and find 1000-day milestones Business Days CalculatorCount business days and weekend days between two dates Countdown TimerLive countdown to any date — days, hours, minutes and seconds, updating every second.