# Date and Time Tools

Updated October 9, 2026

Four free tools for working with dates and times: count the days between any two dates, find your exact age, build a live countdown, or convert a time between 40 cities worldwide. No sign-up, no downloads.

- [**Date Calculator**Days between two dates, or add and subtract days from any date.](/date-calculator/)
- [**Age Calculator**Your exact age in years, months and days, plus a birthday countdown.](/age-calculator/)
- [**Countdown Timer**Live ticking countdown to any date and time, with presets.](/countdown-timer/)
- [**Time Zone Converter**Convert a time between 40 cities with automatic DST handling.](/time-zone-converter/)

## Frequently asked questions

### Are these date tools free?

Yes. All four tools are free forever, with no account and no limits. Every calculation happens in your browser, so your dates never leave your device.

### How accurate is the date math?

Day counts are exact. The tools convert each date to a UTC timestamp and divide by 86,400,000 milliseconds per day, so daylight saving changes can never shift a result by an hour.

### Does the countdown timer keep running?

The countdown ticks live in the open tab using a one-second timer. It does not send notifications or run in the background once the tab is closed.

### How does the time zone converter handle daylight saving?

It uses your browser's built-in IANA time zone database through the Intl API. Offsets are computed for the exact date you pick, so DST is applied automatically when it is in force and skipped when it is not.