About timedate.now
timedate.now answers everyday time and date questions — what time it is somewhere, when the clocks change, when the sun rises, which days are holidays — from open, verifiable data, computed rather than copied, with no account needed.
What's here
- City pages
- 189
- Countries
- 82
- IANA time zones
- 418
- Articles
- 24
- Live local time, time zone, daylight saving rules and clock-change history for cities, countries and every IANA zone.
- Sunrise, sunset, twilight, day length and moon phases for each listed city.
- Public holidays by country, and monthly calendars with holidays, moon phases and ISO week numbers.
- In-browser tools: time zone converter, date calculator, alarm, timer, stopwatch, countdowns and embeddable clocks.
- Explainers on how timekeeping works, each linked to the tool it describes.
Data sources and methods
This edition of the site was built on October 22, 2026 with the dataset versions below. Anything tied to "now" — the current time, the next clock change, today's sunrise — is recalculated in your browser when the page loads.
| Data | Source | How it is used |
|---|---|---|
| Time zones, UTC offsets, daylight saving rules | IANA tz database, release 2026e (via ICU/CLDR 48.0) | Clock-change dates and offset history are computed from the database at build time. Live clocks use your browser's own copy, which updates with your browser. |
| Zone-to-country mapping, names, currencies | Unicode CLDR 48.0 | Country and region pages; English names for zones. |
| Sunrise, sunset, twilight, moonrise | SunCalc 1.9.0 | Standard astronomical formulas, including atmospheric refraction at the horizon. Typically within a minute or two at mid latitudes; less precise near the poles, where the sun skims the horizon. |
| Moon phases, equinoxes and solstices | Jean Meeus, Astronomical Algorithms (2nd ed.), chapters 27 and 49 | Exact instants of new, first-quarter, full and last-quarter moons and of the seasons, to about a minute. Checked against published times for 2026. |
| Public holidays | date-holidays 3.28.0 | National public holidays and observances. Holidays set by lunar calendars or government decree can move; check official sources for anything critical. |
| Weather forecasts | Open-Meteo | Fetched live by your browser on weather pages. |
| Regional time-keeping notes | Written by hand | Split time zones and local daylight saving exceptions, checked against the tz database's own commentary. |
Flag emoji on Windows use Twemoji graphics, licensed under CC-BY 4.0.
Editorial standards
Articles and hand-written notes are produced by the timedate.now editorial team. Each one follows the same rules:
- Primary sources first. Standards bodies and official references (IANA, ISO, NIST, IERS, national governments) over secondary summaries. Each article lists the sources it relies on.
- Computed, not copied. Dates, offsets and astronomical times quoted in articles come from the same code that runs the site's tools, so the article and the tool cannot disagree.
- No guessing. If a claim can't be verified, it is left out. Contested history is labelled as such.
- Dated revisions. Articles show their publication date, and an "Updated" date when facts change.
Corrections
Time zone rules change several times a year, usually with little notice. If something here is wrong — a clock-change date, a holiday, a sunrise time — email [email protected] with the page address and, if you can, a source. Corrections to data are prioritised over everything else, and fixed articles get an updated date. More on the contact page.
Privacy and publisher
Tools keep their state (alarms, stopwatch laps, timer presets, your preferred clock format) only in your browser's local storage. Visitor statistics use Umami, which sets no cookies; advertising partners may, as described in the policy. Read the full privacy policy; the company that publishes this site is identified there.