Understanding Time Zone Abbreviations
Time zone abbreviations are shorthand codes used to identify specific time zones around the world. Each abbreviation typically represents a region's standard or daylight saving time offset from Coordinated Universal Time (UTC). For example, EST (Eastern Standard Time) indicates UTC-5, used by cities like New York and Toronto during winter months.
Some abbreviations can be ambiguous — "CST" can mean Central Standard Time (UTC-6), China Standard Time (UTC+8), or Cuba Standard Time (UTC-5). When precision matters, it's best to use the UTC offset directly or the IANA timezone identifier (e.g., "America/New_York").
The table below lists the most commonly used time zone abbreviations worldwide. Use the search box to quickly find any abbreviation, full name, or city. Abbreviations marked with an asterisk (*) indicate daylight saving / summer time variants.
Many countries observe daylight saving time (DST), shifting their clocks forward by one hour during warmer months. This means a single region may use two different abbreviations throughout the year — for example, the US East Coast uses EST in winter and EDT in summer.