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 on our servers. 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?
Not on our servers. Every calculation happens locally in your browser, and the dates and times you enter are never uploaded or logged. Your last inputs are saved in this browser's local storage so you don't have to retype them; clearing your site data removes them.
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