In the mysql database have been created and populated. Named time zones can be used only if the time zone information tables as a named time zone: 'Europe/Helsinki', 'US/Eastern', or 'MET'.Note: A timezone can be set in 2 formats: There are 3 places where the timezone might be set in MySQL: Get a current timezone datetime from a negative UNIX timestamp integer SELECT DATE_ADD(' 00:00:00',INTERVAL -957632400 SECOND) Get a UTC datetime from a UNIX timestamp SELECT CONVERT_TZ(FROM_UNIXTIME(`unix_timestamp_int`), '+00:00') Get a current timezone datetime from a positive UNIX timestamp integer SELECT FROM_UNIXTIME(`unix_timestamp_int`) FROM `table_name` To get a UTC datetime column as a UNIX timestamp SELECT UNIX_TIMESTAMP(CONVERT_TZ(`utc_datetime`, '+00:00', FROM `table_name` To get the timestamp column as a UNIX timestamp SELECT UNIX_TIMESTAMP(`timestamp`) FROM `table_name` To get the current UNIX timestamp (in seconds): SELECT UNIX_TIMESTAMP(NOW()) It will return 02:00:00 if your timezone is +2:00. To select the timezone that was set when the server launched SELECT "MSK" or "+04:00" for Moscow time for example, there is (or was) a MySQL bug where if set to a numerical offset it would not adjust the Daylight savings time To get the current timezone SELECT TIMEDIFF(NOW(), UTC_TIMESTAMP) To select the current datetime in UTC: SELECT UTC_TIMESTAMP() Įxample result: 17:02:41 To select the current datetime in the session timezone SELECT NOW() You can also set the sever or global or current session timezone to UTC and then select the timestamp like so: SELECT `timestamp_field` FROM `table_name` No matter what timezone the current MySQL session is in: SELECTĬONVERT_TZ(`timestamp_field`, '+00:00') AS `utc_datetime` To select a timestamp column in UTC format NULL, unless you specifically set the column to allow null when you MySQL stores " 00:00:00" if you set a datetime column as MySQL can store partial dates in datetime columns, these look like Is in the current session timezone and convert it to UTC for When storing a date in a timestamp, MySQL will assume that the date When selecting a date MySQL will automatically convert it to the Internally a MySQL timestamp column is stored as UTC but
The timestamp column only supports dates 00:00:01 to 03:14:07 UTC, due to a limitation. Warning! different regional timezones might produce the same datetime value due
GMT confuses seconds, which is why UTC was invented. Warning! UTC has leap seconds, these look like ' 23:59:60' and canīe added randomly, with 6 months prior notice, due to the slowing of Timestamp, but it will select a different datetime from MySQL Timezone CheatsheetĬhanging the timezone will not change the stored datetime or
#Utc global clock how to#
Here are some notes I collected of how to work with timezones as a form of cheatsheet for myself and others which might influence what timezone the person will choose for his/her server and how he/she will store date and time. On the other hand if you have control of the timezones of the servers you work with then you can have everything set to UTC internally and never worry about timezones and DST, at least when it comes to storing internal time. It seems that it does not matter what timezone is on the server as long as you have the time set right for the current timezone, know the timezone of the datetime columns that you store, and are aware of the issues with daylight savings time.
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