Currently whenever a user creates a new account, I have a Creation_date column that has datatype timestamp. Currently this timestamp reads 3 hours ahead of EST (if it's 5PM in Boston it reads 8PM). Is there a way to change the timezone to EST? What timezone is it set to currently?
This has to do with MySQL's timezone.
You can set it per connection (e.g. via PHPMyAdmin) with the following:
SET time_zone = timezone;
However, this will reset if MySQL restarts. So it is better set at the server level. Which, I assume, you can't.
I encourage you to read more from the MySQL Docs.
Accordingly with this question
SET SESSION time_zone = '+8:00'
TIMESTAMP values are converted to UTC when inserted into the DB and converted back to the current timezone set in MySQL on retrieval. The other answers show how to set the timezone in MySQL which will determine what value comes out of the database.
Another option is to use a DATETIME column, store ALL of your dates in UTC, and convert them to the desired timezone in your application (PHP or wherever you get the values from).
SET GLOBAL time_zone = timezone;
This is a COMPLETE example, for Argentina
SET GLOBAL time_zone = "-03:00";
you just need to change the "-03:00" for your timezone and run that command like a simple query, even in PhpMyAdmin.
Related
Is there any way to get the time from my database at my given timezone only for return query. On SET or UPDATE I want to use the UTC timezone as before.
Already used
SET GLOBAL time_zone = '+6:00';
But it changes my write timezone too.
I need to delete entries from my MySql table which is less than current date. I am using this query for that.
delete FROM Offers WHERE ed < DATEADD(dd,-1,GETDATE())
I am working on Windows Azure and my server is running on a different time zone. I am not seeing any option to change my MySql server time zone.
What is the query for calling GETDATE() function on a specific time zone.Or I need to convert current time to a specific time zone (I need gmt+5.30).
Can I get a query something like this , delete FROM Offers WHERE ed < DATEADD(dd,-1,GETDATE()+5.30)
You can set MySQL timezone by using this query
SET GLOBAL time_zone = '+5.30';//Your timezone
SET GLOBAL time_zone = 'Europe/Helsinki';//Your timezone name
SET ##global.time_zone='+00:00';//Your timezone
You can set a different timezone for current session like below. See Documentation for more information.
SET time_zone = timezone_name;
(OR) You can as well set global server timezone using
SET GLOBAL time_zone = timezone_name;
When exporting a file through phpMyAdmin some timestamps are put back an hour. How may I prevent this? I do not want timestamps tampered with. Here's a screenshot for the curious (see the dates.)
I believe the cause may be the SET time_zone = "+00:00"; that is added to every export file.
Is this suppose to happen? Is it a known bug?
I'm running:
-- Server version: 5.5.37-0ubuntu0.14.04.1
-- PHP Version: 5.5.9-1ubuntu4
The times are not actually being 'tampered with'.
MySQL interally stores TIMESTAMP columns converted to UTC time, then uses a mixture of system and session (client session) values to determine what to display to the user.
You can check both of these values running the following query yourself.
SELECT ##global.time_zone, ##session.time_zone;
So when your PHPMA script generates its dump, its specifying a session time_zone variable so when you run it MySQL will convert them all from that timezone back to UTC. When you then go to import that to another database, it will still convert them back to the UTC values you're expecting.
So to summarise if the values in the dump with SET time_zone = "+00:00"; are all "1 hour behind" the values you see when querying via PHPMyAdmin, this only appears this way because the connection via PHPMyAdmin will have it's timezone one hour ahead of UTC.
This has been asked before but not the answer I am looking for. I am storing all my dates in MYSQL in UTC/GMT. When I extract data fora user that references time is it better to use the CONVERT_TZ construct...
SELECT CONVERT_TZ(mytime,'UTC',usertimezone) as mytime FROM table
or is it better to temporarily set the session zone in Mysql and then do normal queries?
SET time_zone = usertimezone;
And if I use the second, do I just do that once for each user session or if I am not using a persistent open, do I need to set it before each query?
Use TIMESTAMP if you want MySQL to do the conversion based on the time_zone setting of the current session.
Use DATETIME if you are returning UTC to your application for it to handle the conversion there. (This would be my preference.)
Don't try to mix these up. DATETIME will not do anything with the time_zone setting, and TIMESTAMP cannot be assumed to be UTC when it is returned to your application unless you are absolutely sure that time_zone is set to UTC.
If your data is stored in TIMESTAMP type columns, then you should SET time_zone and MySQL will automatically convert to/from UTC on retrieval/insertion—you don't need to do anything more. This is the recommended approach.
I need to change the timezone of a single database is this possible?
I know we can change the timezone within our WHM (we are using a dedicated server from hostgator), however a large number of legacy software running on the server has a lot of +6 hours coding in it (i.e. server timezone is CST, we wanted the time in GMT so previous developers altered date/times manually within the code - bad!).
I am now working on a new software and would like to have it all in GMT, I know I can use date_default_timezone_set('GMT') however that will not solve MySQL inserts where the datetime column is set to CURRENT_TIMESTAMP as it will insert # CST timezone.
No, it's not possible to change the timezone for a single database within a MySQL instance.
We can retrieve the server and client time_zone settings with a query, like this:
SELECT ##global.time_zone, ##session.time_zone;
We can also change the client timezone for a session, or change the timezone for the entire MySQL instance.
But we need to be keenly aware of the implication that this change will have on existing client connections, and the how DATETIME and TIMESTAMP values already stored in the instance will be interpreted.
To have the server time_zone set at MySQL instance startup, we can modify the /etc/my.cnf file (or wherever the mysql instance initialization parameters are read from), under the [mysqld] section:
[mysqld]
default-time-zone='+00:00'
-- or --
It is also possible (less desirable) to add the --default_time_zone='+00:00' option to mysqld_safe
NOTE: Changing the timezone setting on the MySQL server does NOT change the values stored in existing DATETIME or TIMESTAMP columns, BUT since it does effectively change the context in which those stored values are interpreted, it will look like all of the values ARE shifted. (Where 08:00 was taken to mean 8AM CST, with the time_zone of the server changed from CST to GMT, that same '08:00' will now be taken to be 8AM GMT, which would effectively be 2AM CST.
Also keep in mind that TIMESTAMP columns are always stored in UTC, while DATETIME columns do not have a timezone.
http://dev.mysql.com/doc/refman/5.5/en/datetime.html
Each client session can change the timezone setting for their own session:
SET time_zone='-06:00';
But none of this really "solves" the timezone conversion problem, it just moves the conversion problem around.
There's nothing inherently "bad" with the application layer handling timezone conversions; sometimes, that's the best place to handle. It just has to be done correctly and consistently.
(What's odd about the setup you describe is that the app is storing DATETIME values as if the MySQL server time_zone is set to GMT, but the MySQL server time_zone is set to something else.)
If you can't change your current time zone you can change the result.
date 2015-01-05 12:06:16
Select date + Interval 2 Hour 'date' From ExampleTable
date 2015-01-05 14:06:16
You can modify the the default value instead of entering current_timestamp make it insert current_timestamp added to hours offset of your timezone. I just did it this way when didn't found any solution, had to invent my own.