14 tools
Date & time tools
Work out durations, differences, weekdays, business days and time zones with simple date calculators.
Free forever · nothing uploaded · no signup
- Age CalculatorAge in years, months and days.
- Date DifferenceDays between two dates.
- Add / Subtract DaysShift a date forwards or back.
- Day of the WeekFind the weekday for any date.
- Leap Year CheckerIs a year a leap year?
- Days in MonthHow many days in a month.
- Add / Subtract TimeShift a clock time by hours/minutes.
- Days Until DateCount the days to a future date.
- ISO Week NumberWeek number for any date.
- Business Days BetweenCount weekdays between dates.
- Time BetweenDuration between two times.
- Day of YearWhich day of the year is it?
- Time Zone ConverterConvert a time across zones.
- Date Format ConverterReformat a date string.
- 1
Nothing is uploaded
Every tool on this page runs inside your browser tab. Your files are read from disk into memory and never sent anywhere.
- 2
No account, no cap
No signup, no email, no daily limit, no watermark, and no paid tier waiting behind the third file.
- 3
Keeps working offline
Load the page once and it still works with the network off, which is the clearest proof that nothing was ever being uploaded.