Date & time tools
Date & Time Calculators
Four fast calculators for birthdays, date gaps, date arithmetic, and time durations — now sharing the same cleaner visual system as the upgraded Pomodoro tool.
4 calculatorsInstant resultsNo sign-up
Why people use these calculators
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Instant results
Updates as you type
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No account needed
Zero sign-up friction
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100% private
Nothing sent to servers
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Mobile friendly
Works on any device
Choose a calculator
Open any tool and start working immediately.
Frequently asked questions
Open the Age Calculator, click the date picker, and select your date of birth. Your age in years, months, and days appears immediately — along with total days lived and days until your next birthday.
Use Date Difference. Select a start and end date; the result shows the gap in years, months, days, weeks, hours, and minutes. Direction doesn't matter — the calculator handles it automatically.
Yes. Add / Subtract lets you choose a base date and enter years, months, or days to add or subtract. Toggle between modes and the resulting date updates instantly.
It calculates the span between two times of day — useful for logging work hours. Enter start and end times; you'll see the gap in hours, minutes, and decimal hours (e.g. 7.5 h).
Yes. All calculations account for leap years, varying month lengths, and correct carry-over when days or months wrap around.
No. Inputs reset when you reload. This is intentional — the tools are designed for quick ad-hoc calculations, keeping your data completely private.