About ddhhmmss

ddhhmmss — days, hours, minutes, seconds — is a free toolkit that brings every practical date & time utility into one fast, elegant place. Check the time anywhere in the world, convert between time zones, run timers and stopwatches, count down to the moments that matter, and calculate everything from ages to work hours.

What you'll find here

• Clocks & converters — a live world clock, a DST-accurate time zone converter, current-time pages for 200 major cities, and quick zone-pair converters like EST to GMT.
• Timers — countdown, stopwatch, Pomodoro, HIIT intervals and alarms.
• Calculators — date differences, age, work hours, sleep cycles and more.
• Reference — sun & moon times, Unix timestamps, DST dates and date formats.

Our principles

• Free, no sign-up. Every tool works instantly — no account, no paywall, no interruptions.
• Accurate. Clocks and conversions use your device's IANA time-zone database, so results stay correct through every Daylight Saving Time change.
• Private. The tools run entirely in your browser. We don't track you, and your preferences never leave your device. Read the privacy policy.
• Fast. The site is fully static, self-hosts all assets, and works offline once loaded — you can even install it as an app.

ddhhmmss is actively developed and new tools are added regularly. If something is missing, wrong, or could be better, we'd genuinely like to hear about it — get in touch.