Time & Date Calculators
Work out durations, countdowns, ages, and time-zone differences — instantly and privately.
These free time and date calculators answer the everyday “how long” and “what date” questions: your exact age, the days between two dates, a countdown to an upcoming date, the result of adding or subtracting days, hours worked, and the time in another zone. Each one shows its method and a worked example, so the result is never a black box.
Every calculation runs entirely in your browser using your device's local date and time — nothing you enter is uploaded or stored. They're calendar-correct and leap-year aware, so the numbers hold up for planning deadlines, anniversaries, projects, and travel.
6 time & date calculators
Age Calculator
Calculate exact age in years, months, and days between two dates.
Hours Calculator
Find the hours and minutes between times — including overnight shifts.
Date Calculator
Add or subtract days from a date — and count the days between two dates.
Date Difference Calculator
Days, weeks, months, and working days between two dates.
Time Zone Converter
Convert times between any two cities, with a live world clock.
Days Until Calculator
Count the days left until any date — with weeks and the weekday it lands on.
Frequently asked questions
Which calculator should I use to count down to a date?
Use the Days Until Calculator for a countdown from today to a single date. To measure the span between two specific dates, use the Date Difference Calculator; to shift a date forward or backward by a number of days, use the Date Calculator.
Are these date calculators leap-year accurate?
Yes. They work on real calendar dates, so leap years and the differing lengths of each month are handled automatically. Date handling is local-time based, so results don't drift by a day across timezones.
Do these calculators store the dates I enter?
No. Every calculation happens locally in your browser; the dates and times you enter are never uploaded, logged, or stored on a server.
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