Time Zone Converter
Convert times between any time zones worldwide. Daylight saving time is automatically adjusted based on the selected date and location.
Convert Time
How Time Zones Work
The world is divided into time zones based on longitude, each roughly 15 degrees wide. Most zones are offset from Coordinated Universal Time (UTC) by whole hours — for example, Eastern Standard Time (EST) is UTC−5, Central European Time (CET) is UTC+1, and Japan Standard Time (JST) is UTC+9. However, some regions use half-hour or 45-minute offsets: India Standard Time (IST) is UTC+5:30, Nepal Time is UTC+5:45, and the Chatham Islands use UTC+12:45.
Daylight saving time (DST) complicates conversions further. Countries that observe DST shift their clocks forward by one hour in spring and back in autumn, temporarily changing their UTC offset. Not all countries observe DST, and those that do may switch on different dates — so the time difference between two cities can change multiple times per year. This converter handles all DST transitions automatically based on the date you select.
Common time zone abbreviations include: GMT (Greenwich Mean Time), EST/EDT (Eastern US), CST/CDT (Central US), PST/PDT (Pacific US), CET/CEST (Central Europe), IST (India), CST (China), JST (Japan), and AEST/AEDT (Eastern Australia).
Common Conversions
Frequently Asked Questions
The converter uses the JavaScript Intl.DateTimeFormat API, which automatically accounts for daylight saving time (DST) transitions. When you select a date and time, the conversion reflects whether DST is in effect for each time zone at that specific moment.
UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. It does not observe daylight saving time. Other time zones are defined as offsets from UTC — for example, EST is UTC-5, IST is UTC+5:30, and JST is UTC+9.
While most time zones are offset from UTC by whole hours, some regions adopted half-hour or quarter-hour offsets for geographical or political reasons. Examples include India (UTC+5:30), Nepal (UTC+5:45), and the Chatham Islands (UTC+12:45).