Time Zone Converter: Convert Any Time Across 55+ World Time Zones
Time zone confusion is one of the most common sources of scheduling mistakes in global teams, international travel, and remote work. A meeting set for 3 PM in London is 8 PM in Dubai, 10 PM in Singapore, and 10 AM in New York — and those offsets shift by an hour twice a year when Daylight Saving Time changes.
Our Time Zone Converter handles all of this automatically using IANA timezone identifiers and the browser's built-in Intl API, which carries the complete DST rule database. You get the correct offset whether it's January or July, whether your target zone observes DST or not. Convert live current time with a 1-second update tick, or switch to Custom Time mode to plan future events precisely.
55+ zones are organized by region in grouped dropdowns for fast navigation. The time difference panel shows the signed offset (e.g. +5h 30m ahead), and a live popular zones reference panel lets you check 10 major world cities at a glance.
Offsets are computed using the browser's Intl.DateTimeFormat API for the specific date entered, ensuring correct DST application. UTC offsets for DST-observing zones vary between summer and winter values.
Understanding UTC Offsets and DST
Every timezone is defined by its offset from UTC (Coordinated Universal Time) — how many hours and minutes ahead or behind UTC it runs. Some zones have half-hour or quarter-hour offsets: India (IST) is UTC+5:30, Nepal (NPT) is UTC+5:45, and Iran (IRST) is UTC+3:30.
Daylight Saving Time (DST) shifts clocks forward by 1 hour during summer months to extend evening daylight. This means the UTC offset for DST-observing zones changes twice a year. For example:
• New York is UTC-5 in winter (EST) and UTC-4 in summer (EDT)
• London is UTC+0 in winter (GMT) and UTC+1 in summer (BST)
• Sydney is UTC+10 in winter (AEST) and UTC+11 in summer (AEDT) — but Sydney's summer is December–February
Zones like India (IST), Japan (JST), China (CST), and UAE (GST) do not observe DST and maintain a constant offset year-round.
Common International Conversion Reference
When it's 12:00 PM UTC:
• New York (EST): 7:00 AM (UTC-5) / 8:00 AM EDT in summer
• Los Angeles (PST): 4:00 AM / 5:00 AM PDT in summer
• London (GMT): 12:00 PM / 1:00 PM BST in summer
• Paris/Berlin (CET): 1:00 PM / 2:00 PM CEST in summer
• Dubai (GST): 4:00 PM (UTC+4, no DST)
• India (IST): 5:30 PM (UTC+5:30, no DST)
• Singapore (SGT): 8:00 PM (UTC+8, no DST)
• Tokyo (JST): 9:00 PM (UTC+9, no DST)
• Sydney (AEST): 10:00 PM / 11:00 PM AEDT in summer
Practical Examples
Scheduling a Global Team Meeting: India to USA
Finding the optimal meeting time between a team in Bengaluru (IST) and New York (EST) during winter.
- 1.From: India — IST (UTC+5:30)
- 2.To: USA — Eastern (UTC-5 in winter / UTC-4 in summer)
- 3.Time difference: −10h 30m (New York is 10.5 hours behind IST in winter)
- 4.Best overlap: 8:30 PM IST = 10:00 AM EST — workday hours for both
- 5.Summer adjustment: During EDT (UTC-4), the gap narrows to −9h 30m
Flight Arrival: London to Tokyo
Calculating local arrival time in Tokyo when departing London at 11:00 AM BST on a 12-hour flight.
- 1.Departure: 11:00 AM BST (London, UTC+1 in summer)
- 2.Flight time: 12 hours
- 3.Arrival UTC: 11:00 AM + 12h = 23:00 UTC
- 4.Tokyo (JST, UTC+9): 23:00 UTC + 9h = 08:00 AM next day
- 5.Offset difference: +8h (Tokyo is 8 hours ahead of BST in summer)
Frequently Asked Questions
How many time zones does this converter support?
55+ time zones covering all major world regions: UTC, Americas (15 zones), Europe (15 zones), Asia/Pacific (20 zones), and Africa/Middle East (7 zones). All zones use official IANA timezone identifiers (e.g. America/New_York, Asia/Kolkata).
Does the converter account for Daylight Saving Time (DST)?
Yes, automatically. The converter uses the browser's built-in Intl.DateTimeFormat API with IANA timezone names, which includes the complete DST rule database. The correct offset for summer or winter time is applied based on the specific date you enter.
What is the difference between Current Time and Custom Time modes?
In Current Time mode, the tool shows live real-time conversion that updates every second. In Custom Time mode, you enter a specific date and time (in the From timezone) and the tool converts it to the To timezone — useful for scheduling meetings across time zones.
How do I schedule a meeting across time zones?
Switch to Custom Time mode, set your From timezone to your local zone, enter the proposed meeting time, then set the To timezone to your colleague's zone. The result shows exactly what time it will be for them. Use the quick example pairs (India → USA, UK → Japan, etc.) as starting points.
What is the time difference shown?
The Time Difference field shows the signed offset between the To timezone and the From timezone. For example, if From is UTC and To is IST (India), the difference is +5h 30m, meaning IST is 5 hours and 30 minutes ahead of UTC.
What are the quick example pairs?
Five pre-loaded pairs covering common international conversion scenarios: India (IST) → USA (EST), UK (GMT/BST) → Japan (JST), Sydney (AEST) → London (GMT/BST), New York → Dubai (GST), and Berlin → Singapore (SGT). Click any pair to instantly load both timezones.
Can I click on the popular zones panel?
Yes. The Popular Time Zones panel at the bottom shows 10 major zones with their current live times. Clicking any row sets it as the To timezone.
Does the tool work offline?
Yes. All conversion logic uses the browser's built-in JavaScript Intl API. No external API calls are made. Once the page is loaded, it works without any internet connection.