Free online tools for date calculations, timers, stopwatch, and Unix timestamp conversions.
Calculate the difference between dates, times, or date and times
Add days, weeks, months, or years to a date
Subtract days, weeks, months, or years from a date
Visual countdown with progress ring and audio alert
Precise stopwatch with laps, splits, and fullscreen mode
Convert Unix timestamps to human-readable dates
Convert dates to Unix timestamps
Focus timer with work sessions and break intervals
Work/rest intervals with round tracking and audio alerts
Live world clock with time zones and browser alarms
Dramatic countdown timer with animated fuse and explosion
Two-player chess clock with presets, Fischer increment, and move counting
Visual metronome with adjustable BPM, time signatures, and tap tempo
See how much a meeting costs in real time
Stopwatch with split and lap time recording
Repeating countdown that auto-restarts each round
Live digital and analog clock with date display
Extra-large stopwatch with fullscreen mode and lap recording
Oversized digit countdown with HH:MM:SS and colour-coded progress
Counts down then counts up — see how far past zero you've gone
Retro nixie tube display showing the current time with warm glow
Set alarms in your browser with a visual clock face and audio alert
Classic pendulum clock with Roman numerals and swinging pendulum
A 7-segment LED digital clock with 12/24-hour format and optional seconds
Whether you need to calculate the days between two dates, set a countdown timer, track elapsed time, or convert Unix timestamps, these tools give you accurate answers in seconds. Every tool runs directly in your browser — nothing to install, no account to create, and no data ever leaves your device.