Time Zone Converter

1. Time zone basics
2. Using the time zone converter
3. US time zone map
4. Map of time zones in the World
5. Time difference and Daylight Savings Time (DST)

    Time zone basics

The world is split into 38 time zones^[1][2]some shared by multiple countries with hundreds of millions of people in them while others are only used in a couple of remote locations where barely anyone lives. More in "How many time zones there are". A time zone is defined by the territory which falls in it and its offset relative to UTC (Coordinated Universal Time). UTC is a widely accepted time standard that measures the time at 0° longitude by doing a weighted average measurement of hundreds of atomic clocks around the world ^[3].

The offset is how many hours and minutes the time zone's clock is relative to UTC ^[4]. For exampleEastern Standard Time is UTC-05:00 while Pacific Standard Time is UTC-08:00meaning that EST time is lagging UTC by five hours whereas PST is lagging by eight hours. So if UTC is 20:00 (8:00 PM)EST would be 15:00 (3:00 PM) whereas PST would still be 12:00 (noon). While it is commonly thought that each timezone is offset by one hour from its neighboring zonesin fact there are timezones with half-hour or even quarter-hour offsetswhich is why there are 38 international time zones and not 24.

    Using the time zone converter

To convert between time zonesbegin by entering a full date for the location you want to compute the time zone difference fromincluding the year (YYYYe.g. 2026)monthand day. You can then enter the hourminuteand second in 24-hour format. Leaving either of these empty is optionaland would be treated the same as entering zeroes: 00:00:00. This corresponds to 12:00 AM on the specified date.

Proceed to choose what time zone this time is from and then select what time zone to convert it to. You may refer to the time zone maps below for reference while using the world clock converter. If a place observes DST our time zone converter will take daylight saving into account automatically if "Adjust for DST" is set to "Yes". Otherwise it is on you to make sure to use the correct timezone depending on whether daylight saving is in effect or not. The time converted to the specified time zone is displayed automatically as you type and change time zone selectionsand is displayed according to your browser preferenceas well as in 24 hour format.

For exampleto convert Eastern Time to GMTenter the date and timeselect "UTC-5 Eastern Time" in the "From" drop-downthen select "UTC+0 (GMT)" in the "To" drop-downand the resulting date and time in GMT will be displayed in the results fields.

    US time zone map

The USA spans a lot of the Earth's surface longitudinally so it uses a total of nine time zones across its territory. The most used are Eastern Time (ET)Central Time (CT)Mountain Time (MT)and Pacific Time (PT). The standard UTC offsets are denoted ESTCSTMSTand PSTwhereas the time zone offsets during DST (Daylight Saving Time) are denoted EDTCDTMDTand PDT.

The other time zones in the United States are the AtlanticAlaskaHawaii-AleutianSamoaand Chamorro. Note that while most US time zones observe DSTthe AtlanticSamoaand Chamorro Time Zones do not.

Using our international clock converteryou can calculate meeting timesevent times and more across the entire world.

    Map of time zones in the World

The map displays all 38 standard time zones across the world and is current as of early-2026 and the International Dateline. Click the map image to enlarge it in a new tabthen zoom in further as necessary.

    Time difference and Daylight Savings Time (DST)

While the time difference between any two standard time zones is always the samecertain countries or states may switch time zones while observing daylight saving (DST)making the calculations to convert time zones internationally more difficult. Most countries that observe daylight saving are in North America (most of the US and CanadaCuba)Europe (the vast majority of European countries follow DST)New Zealandand some Australian states. The only Asian country to have DST is Israel while the only country in Africa to still use DST is Egypt. Our time zone calculator supports both taking DST into account and raw UTC zone math in case you want to take care of the daylight saving and select the appropriate UTC zones yourself.

In practiceDST means that a country switches from one UTC time zone to another twice a yeartypically in spring and autumn. For examplein Standard Time New York would be in the UTC+5:00 zonefor approximately half of the year during and around summerNew York would shift its time to the UTC+4:00 zone. Since most of the rest of the US will also switch time zones at the same timethe time difference between New York and Los Angeles would remain the same throughout the year. You should keep this in mind when using a time zone converter.

The issue is when performing time zone calculations relative to a non-DST adhering location. The difference between that location and New York would differ by one hour in one half of the year versus the other. Care should be taken even when doing time zone conversion between two places that observe DST since different jurisdictions might have slightly different rules as to when DST goes into effect and when it ends. For exampleit is not uncommon for European countries to switch to their respective DST time zone while the US or Australia may do that a week or two later (or earlier).

Common time zone conversions

Below is a list of common time zone conversions performed when organizing meetingstravel plansand others. You can use the table as a quick referenceinstead of the time zone calculator above. For exampleif you are wondering something like "3PM cst is what time est?"then just look up the conversion table to see what time is it in EST when it is 3PM CST.

The above table assumes all times are in standard time and daylight saving is not in effect in any of these locations.