Free online time & date tools
Ten instant time and date utilities that run entirely in your browser. No signup, no server, nothing leaves your device.
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Pomodoro Timer
Focus timer using the Pomodoro technique: 25-minute work sessions with 5-minute short breaks.
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Countdown Timer
Set a custom countdown in hours, minutes, and seconds with an audio alarm.
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Stopwatch
Precise stopwatch with lap recording and split times.
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World Clock
See the current time in multiple cities and time zones simultaneously.
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Age Calculator
Calculate exact age in years, months, days, and hours from a birthdate.
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Date Difference
Find the gap between two dates in days, weeks, months, and years.
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Week Number
Find the ISO week number and day of year for any date.
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Business Days Calculator
Add or subtract working days from a date, or count business days between two dates.
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Time Format Converter
Convert between 12-hour and 24-hour time formats instantly.
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Unix Timestamp
Convert between Unix timestamps and human-readable dates with millisecond precision.
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Why use browser-based time tools?
Every tool on this page runs entirely inside your browser using the standard JavaScript Date API and Web Audio API — no data is ever sent to a server. Timers and clocks work offline once the page has loaded, and your dates, schedule details, and birthdates stay completely private. The calculations are instant and accessible on any device.