Time Zone Converter
Enter a date and time, select the source timezone and target timezone to see the converted time.
Reviewed by the ToolNestr Editorial Team — July 2026
Business hours overlap between major regions
Typical working hours overlap (in hours per day) between common business regions.
Remote Team Coordinator
Schedules meetings and sets working hours that accommodate team members spread across 4 continents with minimal overlap conflicts.
Traveler
Converts flight departure and arrival times between home and destination timezones to plan itineraries without confusion.
Event Planner
Sets virtual event start times that appear at reasonable hours in every participant's local timezone.
Customer Support
Coordinates shift handovers and SLA coverage across global support centers in different timezones.
| Abbreviation | Full name | UTC Offset | Example location |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC+0 | Reykjavik, Accra |
| GMT | Greenwich Mean Time | UTC+0 | London (winter) |
| EST | Eastern Standard Time | UTC-5 | New York (winter) |
| EDT | Eastern Daylight Time | UTC-4 | New York (summer) |
| PST | Pacific Standard Time | UTC-8 | Los Angeles (winter) |
| PDT | Pacific Daylight Time | UTC-7 | Los Angeles (summer) |
| CET | Central European Time | UTC+1 | Paris, Berlin (winter) |
| CEST | Central European Summer Time | UTC+2 | Paris, Berlin (summer) |
| IST | India Standard Time | UTC+5:30 | Mumbai, Delhi |
| JST | Japan Standard Time | UTC+9 | Tokyo, Osaka |
| AEST | Australian Eastern Standard Time | UTC+10 | Sydney (winter) |
| AEDT | Australian Eastern Daylight Time | UTC+11 | Sydney (summer) |
| BST | British Summer Time | UTC+1 | London (summer) |
| CST | China Standard Time | UTC+8 | Shanghai, Beijing |
How time zone conversion works
Time zone conversion works by adjusting a given time from one timezone to another using UTC offset differences. Each timezone has a standard offset from UTC (e.g., EST is UTC-5) and may have an additional DST offset during certain months (e.g., EDT is UTC-4). The source time is converted to UTC by applying its offset in reverse, then the target timezone offset is applied to get the local time in the destination.
Worked example
How to use the Time Zone Converter
Pick date and time
Use the date and time inputs to set the moment you want to convert from.
Select timezones
Choose the source timezone (from) and the target timezone (to) from the dropdown menus.
View converted result
The result panel shows the source time, UTC equivalent and target time side by side with DST info.
Tips for timezone conversion
Always confirm DST status
DST transitions happen on different dates in different countries. A meeting that works in March may shift by an hour in April. Always double-check for the specific date.
Use UTC for scheduling
When sending meeting invitations across timezones, state the time in UTC and let each participant convert to their local time. This avoids misinterpretation.
Watch for half-hour and quarter-hour zones
Not all offsets are full hours. India (UTC+5:30), Iran (UTC+3:30), Nepal (UTC+5:45) and the Chatham Islands (UTC+12:45) use unusual offsets that are easy to miscalculate.
Why timezone conversion matters
In a globally connected world, a 10 AM meeting in New York is 3 PM in London and midnight in Sydney. Misunderstanding timezone differences causes missed deadlines, failed calls and scheduling chaos. An accurate timezone converter eliminates guesswork and ensures everyone shows up at the right time.
IANA timezone database
The IANA (Internet Assigned Numbers Authority) Time Zone Database, also called tzdata, is the authoritative source for timezone information worldwide. It contains the history of every timezone's rules, including DST changes, offset changes and name changes. It ships with most operating systems and is used by JavaScript's Intl API.
DST complications
DST adds significant complexity to timezone conversion because transition dates vary by country, hemisphere and sometimes even within a country. The spring-forward transition skips an hour entirely, while fall-back repeats an hour. These edge cases can cause software bugs and scheduling errors if not handled properly.
When to use the time zone converter
The time zone converter is essential for anyone coordinating across different regions. Remote teams with members in New York, London, and Tokyo face the challenge of finding meeting times that work for everyone. For instance, 10 AM in New York is 3 PM in London and 11 PM in Tokyo. Our converter instantly shows these relationships, helping team leaders select times that minimize disruption for the largest number of participants. This is especially critical for all-hands meetings, sprint planning, and client calls where attendance is mandatory.
Travelers rely on the converter to avoid confusion with flight schedules. A flight departing from Dubai at 2 AM local time and arriving in New York 14 hours later might seem straightforward, but time zone differences mean the arrival time could be 7 AM or 8 PM depending on DST status. The converter eliminates this confusion by showing the exact arrival time in the destination timezone, accounting for both the flight duration and the offset difference. It also helps with planning connecting flights where multiple time zone boundaries are crossed.
Event planners use the converter for virtual conferences and webinars with global audiences. Setting a webinar start time requires knowing what the time will be in every participant's local timezone. A 2 PM webinar in London might be 9 AM in New York, 6 AM in Los Angeles, and 9 PM in Singapore. The converter helps planners avoid scheduling events during unreasonable hours for key audience segments, improving attendance rates and participant satisfaction.
Customer support teams coordinating global coverage use the converter for shift scheduling. If a support center in Manila closes at 6 PM local time and another center in Cairo opens at 9 AM local time, the converter confirms whether there is a handover gap or overlap. This ensures continuous coverage for customers without overworking any single team. The converter is also valuable for financial traders tracking market openings across Tokyo, London, and New York.
Frequently asked questions
How many timezones are supported?
All IANA timezones are available, covering every country and territory in the world — over 500 timezone identifiers.
Does it handle Daylight Saving Time?
Yes. The converter automatically detects whether DST is in effect for the given date and applies the correct offset.
Can I see both source and target times side by side?
Yes. After conversion the result panel shows both times clearly, along with the UTC equivalent and DST status for each timezone.
Is it accurate for dates in the past or future?
Yes. The Intl.DateTimeFormat API handles historical timezone rules and future DST transitions as defined by the IANA database.
What does UTC equivalent mean?
UTC equivalent is the same moment expressed in Coordinated Universal Time — the common reference point that all timezones are offset from.
Can I use city names or just timezone codes?
The dropdowns include major city names alongside their IANA timezone identifiers for easier selection.
Is my data sent to a server?
No. All timezone conversions happen entirely in your browser with no network requests.
How do I convert a specific date and time?
Use the date and time inputs to set the moment you want to convert. The result updates instantly when either input changes.
Does it show timezone abbreviations like EST or PST?
Yes, the current timezone abbreviation for each selected zone is shown alongside the offset.
Can I convert between timezones that use half-hour offsets?
Absolutely. The IANA database includes all fractional offsets such as UTC+5:30 (India), UTC+5:45 (Nepal), and UTC-3:30 (Newfoundland).