What Is TimeShift?
TimeShift is a time zone converter built for people who actually work across time zones, not just look at them occasionally. It covers 400+ IANA time zones, handles daylight saving transitions automatically, and includes a meeting planner that finds overlapping work hours between distributed teams. If you have ever stared at a clock trying to figure out whether Tokyo is 13 or 14 hours ahead right now, this tool exists because of that exact frustration.
The tricky part about time zones is that they are not static. DST rules change from year to year, and different countries adopt or abandon daylight saving on their own schedules. TimeShift uses the Intl API built into your browser, which means it stays current with your operating system's time zone database. No stale offset tables sitting on a server somewhere.
How to Use TimeShift
The Convert tab is straightforward: pick a date, enter a time, choose your source and target zones, and the result appears instantly. You can copy it, download an ICS calendar file, or generate a shareable link that includes the conversion parameters in the URL.
The World Clock tab lets you track multiple cities simultaneously with live-updating clocks. The Meeting Planner is where things get really useful -- add three or four time zones, set your work hours, and the timeline visualization highlights exactly which hours overlap across every zone. No more mental arithmetic. The Batch tab handles bulk conversions, so if you have a spreadsheet of timestamps you can paste them in or upload a CSV and convert everything at once.
Your Data Stays Private
TimeShift does not make any network requests at all. Zero. The time zone calculations use your browser's built-in Internationalization API, so there is no server to call and no data to send. Your meeting schedules, your saved cities, your batch conversion files -- all of it stays on your machine. When you close the tab, it is gone unless you explicitly exported something.
Common Questions
Does TimeShift account for daylight saving time?
Yes. TimeShift relies on your browser's Intl API, which uses the IANA time zone database. This database tracks current and historical DST rules for every zone. If you convert a date during a DST transition period, the offset adjusts automatically.
What format should I use for batch conversion?
Paste one timestamp per line, or upload a CSV file with a column of dates and times. TimeShift accepts ISO 8601 format, standard date-time strings, and Unix timestamps. Click the "Load Sample Data" button on the Batch tab to see working examples.
Can I share a specific conversion with someone?
Yes. After converting on the Convert tab, click the Share button to copy a URL that includes the date, time, and both zones. Anyone who opens that link will see the same conversion pre-filled.
Does the converter handle Daylight Saving Time automatically?
Yes. The tool uses the browser's built-in Intl API with the IANA timezone database, which tracks every DST rule for every timezone — including the quirky ones like Australia's Lord Howe Island (which shifts by 30 minutes, not a full hour) and Arizona (which doesn't observe DST at all, except the Navajo Nation, which does). When you convert a time, the result automatically accounts for whether DST is active at that specific date and location.
What's the difference between UTC, GMT, and UTC+0?
Practically, they're the same time. UTC (Coordinated Universal Time) is the modern standard — it's defined by atomic clocks. GMT (Greenwich Mean Time) is the historical predecessor based on solar observations at Greenwich, England. UTC+0 is just a notation meaning "zero hours offset from UTC." In this tool, they're interchangeable. The only technical difference is that GMT can shift by up to 0.9 seconds from UTC due to Earth's irregular rotation, but that matters to astronomers, not meeting planners.
How do I find the best meeting time across timezones?
The meeting planner shows overlapping work hours. Green means everyone is in business hours. Yellow means some are outside normal hours. Red means nighttime for someone. Eliminates timezone mental math.
What happens at daylight saving transitions?
Handled automatically. The tool tracks every DST rule for every region, including edge cases where 2:30 AM does not exist or 1:30 AM happens twice.
Can I decode a Unix timestamp?
Yes, paste seconds or milliseconds since 1970 and see the date in any timezone. Also works in reverse — enter a date, get the timestamp. Common need for developers reading logs and API responses.
How many timezones does the tool support?
Over 300 IANA timezones, covering every region in the world. This includes lesser-known zones that many tools skip, like Australia's Lord Howe Island (UTC+10:30/+11) and Chatham Islands in New Zealand (UTC+12:45/+13:45).