The timezone_identifiers_list () function is used to generate a dropdown list of timezone with PHP. This function is used to return an indexed array containing all the timezone identifiers. The datetimezone object is sent as a parameter to the timezone_identifiers_list () function and it returns an indexed array on success or False on failure.
Full Answer
Is it possible to create a dropdown list of timezones?
You can create very easy a dropdown from this array (It was a time-consuming task to put this together and test it). We already use this list in some of our apps. It is very importantto store timezone identifiers in your database and not just the timezone offset like "GMT+2", because of Daylight Saving Times.
How is the list of timezones generated?
The list of timezones is generated dynamically, and thus automatically updates when timezones might change (in PHP). Timezone names are prettified. For example, "America/St_Barthelemy" becomes "America, St. Barthelemy". Timezones are sorted on offset and name.
How are timezones sorted in the USA?
Timezone names are prettified. For example, "America/St_Barthelemy" becomes "America, St. Barthelemy". Timezones are sorted on offset and name. Toland's answeronly sorts on offset, resulting in unsorted groups of timezones within the same offset.
When do the different time zones become active?
The above time zones are used during other parts of the year. They will become active again after the next clock change as Daylight Saving Time begins or ends. The US dependencies don't use DST.
What are the 7 time zones in order?
From east to west they are Atlantic Standard Time (AST), Eastern Standard Time (EST), Central Standard Time (CST), Mountain Standard Time (MST), Pacific Standard Time (PST), Alaskan Standard Time (AKST), Hawaii-Aleutian Standard Time (HST), Samoa standard time (UTC-11) and Chamorro Standard Time (UTC+10).
How many time zones are there list?
The world is divided into 24 time zones.
What are the 5 major time zones?
For example, this United States time zone map shows the six designated time zones including Eastern, Central, Mountain, Pacific, Alaska, and Hawaii-Aleutian time zones.
What are all 6 time zones?
The United States is spread across six time zones. From west to east, they are Hawaii, Alaska, Pacific, Mountain, Central, and Eastern.
Are there 24 different time zones?
The world is divided longitudinally into time zones, with each hour difference roughly 15 degrees apart. Due to some countries having half hour time zones, there are more than 24 times zones in the world. Most countries, especially the smaller ones, have only one time zone.
What are the different time zones called?
Time Zone MappingsWindows Time Zone NameStandard Time Zone Name(UTC-05:00) Eastern Time (US & Canada)Eastern Standard Time(UTC-05:00) Indiana (East)US Eastern Standard Time(UTC-06:00) Central AmericaCentral America Standard Time(UTC-06:00) Central Time (US & Canada)Central Standard Time97 more rows
Where is the different time zones?
United States and regional time zonesTime zoneDSTStandardMountainUTC−06:00UTC−07:00PacificUTC−07:00UTC−08:00AlaskaUTC−08:00UTC−09:00Hawaii–AleutianUTC−09:00UTC−10:007 more rows
Why are there 24 time zones?
As Earth rotates on its axis, it moves about 15 degrees every 60 minutes. After 24 hours, it has completed a full rotation of 360 degrees. The scientists used this information to divide the planet into 24 sections or time zones.
How time zones are divided?
There are 24 hours in a day, and 360 degrees of longitude encompassing the globe – dividing 360 by 24 gives you the 15 degrees of longitude that equates to a one-hour difference in each time zone. Based on this, you can then deduce that there are 24 time zones around the world.
Where are the four time zones?
What are the 4 time zones in USA? There are actually six time zones in the USA. The four main ones are Eastern, Central, Mountain, and Pacific Standard Time. The two others are Alaska Standard Time and Hawaii-Aleutian Standard Time, observed only by Alaska and Hawaii respectively.
Why does Russia have 11 timezones?
The country was divided into eleven time zones in 1919, after the Bolshevik Revolution, with boundaries going along railroads and rivers, although these time zones have since been revised multiple times.
What does UTC stand for?
Coordinated Universal TimeCoordinated Universal Time / Full namePrior to 1972, this time was called Greenwich Mean Time (GMT) but is now referred to as Coordinated Universal Time or Universal Time Coordinated (UTC). It is a coordinated time scale, maintained by the Bureau International des Poids et Mesures (BIPM). It is also known as "Z time" or "Zulu Time".
ernestbangbuh commented on Feb 1, 2019
Hi i have a table with many columns like cities, countries zip codes and others, i need to add a new column in an ssis package such that when i run the packed a new column called timezone automatically populates with the various times against the countries and cities. How do i achieve this??
soubhikchatterjee commented on Jul 3, 2019
I am using a nodejs/mysql project and wish to use this list, can someone please tell me if its more efficient (in terms of faster loading) of this complete list to load from a file or a mysql db?
hkarakose commented on Mar 18, 2020
Date/time APIs do not support daylight savings changes if you use timezones in GMT or UTC format.
epursimuove commented on Dec 30, 2020
Please listen to @mj1856 saying "Lists like these are dangerous". You will soon have errors in your code, if using these hardcoded lists.
How many time zones are there in the USA?
There are 9 time zones by law in the USA and its dependencies. However, adding the time zones of 2 uninhabited US territories, Howland Island and Baker Island, brings the total count to 11 time zones. The contiguous US has 4 standard time zones. In addition, Alaska, Hawaii, and 5 US dependencies all have their own time zones.
When was the US divided into 4 time zones?
The United States' Time Zone History. The US was divided into 4 standard time zones on November 18, 1883, and jurisdiction for the zones was given to the Interstate Commerce Commission (ICC). Since 1967, the US Department of Transportation (DOT) has been responsible for governing time zones in the country. Time zones in the USA are defined in the ...
What is the generalized time zone?
The time zones in the contiguous US are often referred to by their generic name, without making a difference between standard time and Daylight Saving Time designations. For example, Eastern Time (ET) refers to Eastern Standard Time (EST) or Eastern Daylight Time (EDT), depending on which is currently in use.
What is the 12th time zone?
Since Howland Island and Baker Island constitute the world's westernmost landmasses in relation to the International Date Line, making them the last places on Earth where any date exists, they are sometimes assigned a theoretical 12th time zone called Anywhere on Earth (AoE).
Which states have their own time zones?
In addition, Alaska, Hawaii, and 5 US dependencies all have their own time zones. As neither Hawaii nor the 5 dependencies use Daylight Saving Time (DST), there are only 6 corresponding DST time zones.