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Master Global Time, Effortlessly

A precise, beautifully designed suite of time tools — synced to the world's atomic clocks, used by professionals in 180+ countries.

Direct Answer

Need an instant time answer? Our tools automatically detect your location to provide accurate time zone conversions, meeting overlaps, and date durations. For example, the time difference between New York (EST) and London (GMT) is exactly 5 hours.

Synced to atomic clocks
Time data verified against NIST & BIPM. Last verified July 2026 (UTC).
No tracking, no signup
All calculations run in your browser. We never store your inputs.
Verified against NASA JPL
Astronomical data calibrated against the JPL Horizons system. See sources →
4.8/5 from 12,000+ tool ratings
Data refreshed daily · ISO 8601 compliant · WCAG 2.1 AA
What makes us different

A free tool that doesn't act like one.

We treat time data the way an airline treats a flight schedule: as safety-critical information that has to be right.

Synced to atomic clocks

Every time you see is traceable to NIST and BIPM reference clocks. We don't guess — we sync.

How we sync

Computed in-house

Sun, moon, and astronomical data are computed with pure math — no third-party APIs in the critical path.

See our math

Calibrated to NASA JPL

Astronomical angles and phases verified against the NASA Jet Propulsion Laboratory's Horizons system.

Read about JPL
⭐ Featured this weekUpdated daily

Sunrise & Sunset Calculator

Planning a photoshoot, a hike, or just curious about daylight hours? Get precise sunrise, sunset, golden hour, and twilight times for any location on any date — with a live 3D view of the day/night terminator.

Photographer favorite
60+ cities preloaded
Live 3D globe
Find sun times for my city
No signup · Runs in your browser

Frequently Asked Questions

Quick answers to common time-related questions.

Weekly time zone tips

Save 5 hours a week on scheduling.

One short email each Friday: a scheduling tip, an upcoming DST change, and one time-zone trick used by our team.

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