# Date & Time Tools

> Work with dates, times, durations, and time zones.

URL: https://uttir.com/date-time-tools
Tools in this category: 9

## About this category

Date and time utilities: calculators, converters, and formatting tools that run instantly.

## Tools

- [Time Zone Converter](https://uttir.com/time-zone-converter) — Convert times between time zones and compare them side by side.
- [Cron Expression Parser](https://uttir.com/cron-parser) — Parse a 5-field cron expression and see when it will next fire, with a plain-English explanation.
- [Date Add/Subtract Calculator](https://uttir.com/date-add-subtract) — Add or subtract days, weeks, months, or years from any date. Handles month-end and leap-year rollovers.
- [Countdown Timer](https://uttir.com/countdown-timer) — Count down to a specific date and time. Set a target, watch the days/hours/minutes/seconds tick down live.
- [Cron Expression Generator](https://uttir.com/cron-generator) — Build cron expressions from a simple form, or pick a common preset. See plain-English explanations.
- [Stopwatch](https://uttir.com/stopwatch) — A clean online stopwatch with laps, millisecond precision, and keyboard shortcuts. Runs in your browser.
- [Pomodoro Timer](https://uttir.com/pomodoro-timer) — A Pomodoro timer with 25/5/15 defaults. Focus, short break, long break, and session counter. Customizable phase lengths.
- [Date Formatter](https://uttir.com/date-formatter) — Format any date in ISO, US, EU, long, short, time, Unix, RFC 2822, and ISO week formats. Also converts Unix timestamps.
- [Sleep Calculator](https://uttir.com/sleep-calculator) — Find the best bedtime or wake-up time based on 90-minute sleep cycles. Avoid grogginess by waking at the end of a cycle.

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This file is the markdown rendering at https://uttir.com/date-time-tools.md.