Time Zone Converter

What this tool does

Pick a date and time, choose the time zone it is written in, and choose the time zone you want it in. The tool instantly shows the same moment expressed in the target zone, along with each zone's UTC offset. It is built for the everyday questions that trip people up: what time is a 9am New York meeting for a colleague in Tokyo, when does a UTC deadline actually fall in Seoul, or how a flight's departure and arrival line up across regions. When the converted time lands on a different calendar day, a “next day” or “previous day” badge makes the date change obvious so you don't schedule a meeting a day off. Swap the two zones with one click to convert in the opposite direction, and change any field to see the result update live.

How the conversion works

The time you enter is treated as wall-clock time in the source zone. The tool finds the exact UTC instant that matches, then re-formats that instant for the target zone using your browser's built-in Intl time zone database. Because the calculation reads real IANA offsets, it naturally accounts for zones that sit at half-hour or 45-minute offsets, and for daylight-saving rules on the date you choose rather than a fixed guess. The same inputs always produce the same output, so the result is stable and reproducible.