Every date & time tool,
in one elegant place.
ddhhmmss is the complete date & time toolkit — find every possible date and time related tool and resource in one place: world clock, time-zone converter, countdown & Pomodoro timers, stopwatch, alarms, date, age & business-day calculators, Unix timestamp converter, sun & moon times, DST tracker and more. Free, fast, no sign-up.
Clocks
2 toolsTimers
5 toolsCountdown Timer
Precise countdowns with presets & alarm.
Open Countdown Timer →⏲Online Stopwatch with Laps
Millisecond timing with lap splits.
Open Online Stopwatch with Laps →◔Pomodoro Timer
Focused intervals with a clean ring.
Open Pomodoro Timer →⟳Interval Timer
Work / rest cycles with rounds.
Open Interval Timer →◉Online Alarm Clock
Multiple labelled alarms, any zone.
Open Online Alarm Clock →Date Tools
3 toolsAstronomy
1 toolDeveloper
2 toolsAll your date & time needs, in one toolkit
ddhhmmss is the complete date & time toolkit — find every possible date and time related tool and resource in one place: world clock, time-zone converter, countdown & Pomodoro timers, stopwatch, alarms, date, age & business-day calculators, Unix timestamp converter, sun & moon times, DST tracker and more. Free, fast, no sign-up. Whether you are coordinating a meeting across continents, timing a workout, counting down to a big day, normalising timestamps in code, or just checking what time it is on the other side of the world, you will find the right tool here — and more are added over time.