Time Zone Converter

Time zones divide the world into regions that observe the same standard time. There are 24 primary time zones, each roughly 15° of longitude wide. They are measured as offsets from Coordinated Universal Time (UTC). For example, EST (Eastern Standard Time) is UTC-5, meaning it is 5 hours behind UTC.

EST (Eastern Standard Time) is UTC-5 and is used from November to March. EDT (Eastern Daylight Time) is UTC-4 and is used from March to November when clocks "spring forward" one hour. Most US time zones follow this daylight saving pattern.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks and time. It is effectively the same as GMT (Greenwich Mean Time) for most purposes, though technically they differ — UTC is based on atomic time while GMT is based on solar time.

There are 24 primary time zones, but in practice there are 38+ time zones because some regions use offsets that differ by 30 or 45 minutes (like India at UTC+5:30 and Nepal at UTC+5:45). Including daylight saving variations, there are over 40 distinct time zone offsets in use worldwide.