Convert time between 15 major timezones worldwide and see current times
Our Time Zone Calculator allows you to convert time between 15 major timezones from around the world, including UTC, EST, CST, MST, PST, GMT, CET, EET, IST, JST, CST (China), AEST, NZST, HST, and AKST. Simply select the date and time in your source timezone and choose your target timezone to instantly see the converted time. The calculator also shows the current time in all supported timezones at a glance.
Time zone conversion is essential for international business, travel planning, remote team coordination, and staying connected with friends and family across the globe. Understanding the UTC offset of each timezone helps you quickly calculate time differences without confusion.
UTC (Coordinated Universal Time) is the primary time standard used worldwide to regulate clocks and time. It is the reference point from which all other timezones are calculated as offsets (e.g., EST is UTC-5). It replaced GMT as the international standard but both terms are often used interchangeably.
To calculate the time difference, subtract the UTC offset of the source timezone from the target timezone's offset. For example, EST (UTC-5) to CET (UTC+1) is a 6-hour difference: 1 - (-5) = 6 hours ahead. Remember that daylight saving time may affect offsets depending on the time of year.