Time tools
Unix timestamps, date differences, age, working hours, time zones and a stopwatch with a countdown that beeps.
11 tools · free · no account · nothing uploaded
All 11 time tools
Timestamp Converter
Convert Unix timestamps to human-readable dates and back, in UTC and your local timezone.
Open toolAge Calculator
Calculate exact age from a date of birth in years, months and days, plus a countdown to the next birthday.
Open toolDate Difference
Find the exact days, weeks, months and years between two dates, including an optional business-days count.
Open toolTime Calculator
Add or subtract two durations and see the result in hours, minutes and seconds.
Open toolHours Calculator
Work out hours worked between two times, minus breaks, with decimal hours and optional pay.
Open toolDownload Time Calculator
Estimate download time from file size and connection speed. Enter file size in MB and speed in Mbps to get seconds, minutes or hours, plus the real MB/s rate.
Open toolSleep Calculator
Find bedtimes that fit whole 90-minute sleep cycles before your alarm. Sleep runs in roughly 90-minute cycles; waking between them feels far better than mid-cycle.
Open toolTime Zone Converter
Convert one date and time into sixteen other time zones at once, using your browser's timezone database.
Open toolPomodoro Timer
A 25-minute focus timer with breaks and session counting. Work in focused blocks with automatic breaks; a short beep marks each phase change.
Open toolHijri Date Converter
Convert any Gregorian date to the Hijri calendar and back. Uses the Umm al-Qura calendar built into your browser — no API, no upload.
Open toolStopwatch & Timer
A stopwatch with lap times and a countdown that beeps at zero. Timing uses a 50 ms interval, accurate to a hundredth of a second.
Open toolWhat these time tools cover
Time is the thing most often converted badly. Turn a Unix timestamp into a readable date in UTC or local time, count the days between two dates, work out exact age in years, months and days, add up hours on a timesheet, or compare two time zones before booking a call. A stopwatch with lap times and a countdown timer cover the clock side.
Common jobs
- Decoding a timestamp from an API response or a log line
- Finding the exact gap between two dates in days, not weeks
- Checking the hour difference before scheduling a meeting
Why they run on your device
These pages are static files. The work is done by JavaScript in your tab, so a file or a password never leaves your machine — there is no upload endpoint on this site to send it to. That also means no account, no usage counter and no queue.
Questions
Which time zone is used?
Both are shown: UTC, which is what timestamps store, and your own local zone as the browser reports it.
Does the stopwatch need the tab open?
Yes. Timing runs in the page with a 50 ms interval, so keep the tab visible for a live reading.