Timezone Converter

What is a timezone converter?

A timezone converter translates a date and time from one timezone to another. Every timezone is defined by its offset from UTC (Coordinated Universal Time), the global reference clock. Cross-country calls, international flights, and remote standups all require knowing what a moment looks like in two different places.

The IANA timezone database is the authoritative global registry of timezone rules, maintained by ICANN. Every country's daylight saving schedule, historical offset change, and political boundary adjustment is recorded there. The browser's built-in Intl API reads these rules to compute conversions accurately.

How the timezone converter works

Select a source timezone and a target timezone. Enter the date and time you want to convert, then click Convert. The result shows the equivalent time in the target timezone along with both UTC offsets.

For example, 9:00 AM IST converts to 3:30 AM UTC. That is 11:30 PM the previous day in New York (EST), or 5:00 AM in Dubai (UTC+4). Date rollovers are handled automatically, so a Monday morning in Singapore can display as Sunday evening in London.

Common timezone pairs for India

India Standard Time (IST) is UTC+5:30. Unlike most countries, India does not observe daylight saving time, so the offset never changes.

IST to US Eastern: difference is 10.5 hours in winter (EST, UTC-5) and 9.5 hours in summer (EDT, UTC-4). IST to UK: 5.5 hours in winter and 4.5 hours in summer. IST to Dubai (UAE): 1.5 hours, with UAE at UTC+4. IST to Singapore: 2.5 hours, with Singapore at UTC+8. IST to Tokyo: 3.5 hours, with Japan at UTC+9.

All differences shift by 30 to 60 minutes depending on whether the other country is in daylight saving. The specific date you enter determines which applies.

Tips for accurate timezone conversion

• Always specify AM or PM when entering 12-hour times. A missed AM/PM flip causes a 12-hour error in the result.
• For meetings near daylight saving transitions (March and November in the US), check the converted time on the exact date. The transition can shift by one hour compared to the week before.
• India, China, Japan, and most of Southeast Asia do not observe daylight saving. Conversions to these timezones are stable year-round.
• When sharing converted times with colleagues, include the date and timezone label, not just the hour. 6 PM IST and 6 PM UTC are very different moments.