About AllTimeZone

Our Mission

In an increasingly connected world, people collaborate across continents every day. Scheduling a call between London and Tokyo, planning a meeting that works for New York and Dubai, or simply checking what time it is in a loved one's city should not require mental gymnastics. AllTimeZone exists to make time zone conversion effortless and instant.

We believe that understanding time differences is essential for global business, remote work, travel planning, and staying connected with friends and family worldwide. Our goal is to provide the most intuitive, reliable, and comprehensive timezone tool on the web — completely free, with no sign-up required.

What We Offer

How It Works

AllTimeZone is built on the IANA Time Zone Database (also known as the Olson database), the same authoritative source used by operating systems, programming languages, and internet infrastructure worldwide. This ensures our time data is always accurate, including automatic adjustments for Daylight Saving Time (DST) transitions.

When you add a city to the time grid, we resolve its IANA timezone identifier (e.g., America/New_York or Asia/Tokyo) and generate a complete 24-hour timeline showing local times, business hours, and period classifications for each location. The red cursor line shows the current moment in real time, updating every 30 seconds.

Our prayer time calculations use solar position algorithms based on geographic coordinates, following the conventions of major Islamic authorities. Holiday data is compiled from official government sources and includes support for fixed dates, Easter-based moveable feasts, nth-weekday rules, and approximate Islamic calendar dates.

Data Sources & Accuracy

• ✓Time zones: IANA Time Zone Database, updated with every DST change worldwide.
• ✓City data: GeoNames geographical database covering 33,000+ populated places with coordinates, country codes, and timezone mappings.
• ✓Public holidays: Compiled from official government gazettes and legislative sources, supporting fixed, moveable, and lunar calendar holidays.
• ✓Prayer times: Solar position algorithms following University of Islamic Sciences (Karachi), Muslim World League, and Egyptian General Authority conventions.
• ✓Market hours: Official trading schedules from major stock exchanges, updated for holidays and special sessions.

Built for Speed & Privacy

AllTimeZone is a modern web application built with Next.js, TypeScript, and Tailwind CSS. Pages are pre-rendered at build time for instant loading, while dynamic features like the live clock and meeting planner run entirely in your browser. We use edge caching to ensure fast response times regardless of where you are in the world.

We respect your privacy. AllTimeZone does not require an account or login. We use minimal cookies only to remember your preferred cities between visits. We do not sell, share, or trade any user data. For full details, see our Privacy Policy.