Online Date and Time Tools
Quick answer
Calculate date differences, convert Unix timestamps, and compare times across world time zones — all in your browser, in real time, with no installation required.
Date Calculator
Countdown, difference, age and add/subtract dates.
Time
Timezone Converter
Convert a time between cities around the world.
Time
Unix Timestamp ↔ Date
Convert Unix epoch (seconds/ms) to a readable date and back.
Time
What you can do with the date and time tools
- Calculate the exact difference between two dates in years, months, and days
- Convert a Unix timestamp to a readable date or vice versa, in seconds or milliseconds
- Compare the same time across cities in different time zones to schedule international meetings
- Add or subtract days, weeks, months, and years to any date to plan deadlines
Frequently asked questions
Are the date and time tools free?
Yes. All of them are completely free with no limits and no account required.
Do the tools account for daylight saving time changes?
Yes. The time zone converter uses the browser's Intl API, which has DST data updated automatically by the operating system.
Can I calculate my age with the date calculator?
Yes. The date calculator has a dedicated mode to calculate age in years, months, and days from any date of birth.
Does the time zone converter support cities in the UK and Australia?
Yes. London, Sydney, and Melbourne are included, with daylight saving time calculated automatically for each zone.
Do the tools work offline?
Yes. The date and time tools run entirely in the browser and make no server requests. Once the page has loaded, they work even without an internet connection.