Igor's Blog

For my travelblog.ws project I store all dates as UTC in columns using the DATETIME data type i.e. my code converts dates to UTC before storing them. Because DATETIME is time zone agnostic this worked great, that is until I needed to use the TIMESTAMP data type on a number of new columns that I've added.

The TIMESTAMP data type is treated differently by MySQL, with it's values being converted to UTC for storage and back to the system time zone upon retrieval. This messed up a number of dates for me because all of a sudden some dates that should have matched were now 10 hours out (I'm in the AEST/GMT+10 time zone).
mysql_tz.png


The solution was to force MySQL to think it's in the UTC time zone so there was no need to worry about these automatic conversions. The catch was that I was not able to change the time zone setting on the MySQL server itself, so the change had to be done on a connection basis.

I was using PDO and simply executing "SET time_zone = '+00:00'" didn't seem to work for me, but eventually I did find a way to do this. Below is the code I used (adjust connection details to suit)...
 PHP
$dbHost = 'localhost';
$dbName = 'mydb';
$dbCharset = 'utf8';
$dbUser = 'user';
$dbPasswd = 'password';
$dbConnDsn = 'mysql:host=' .$dbHost.
';dbname=' .$dbName.
';charset=' . $dbCharset;
$initArr = array(\PDO::MYSQL_ATTR_INIT_COMMAND => "SET time_zone = '+00:00'");
$dbConn = new \PDO($dbConnDsn, $dbUser, $dbPasswd, $initArr);


The trick was to set the PDO::MYSQL_ATTR_INIT_COMMAND value to the SET time_zone = '+00:00' statement when creating the PDO object.

Once I added that code, MySQL treated all of my connections as if they were in the UTC time zone!



-i

comments powered by Disqus
Other posts you may like...
Programming, DIY, Games, Hacks, and Tech

Recent Blog Posts

Converting a CSV file containing commas in quotes to a pipe separated file using Awk and Bash

How to get Facybox gallery popup to work for images with dynamic URLs

jQuery UI Photoboxr plugin updated to version 0.2

Learn How to Add Disclaimer to All Outgoing Emails in Office 365

How to securely host your web site for free with Google Cloud and CloudFlare (part 3)

How to securely host your web site for free with Google Cloud and CloudFlare (part 2)

How to securely host your web site for free with Google Cloud and CloudFlare (part 1)

Beware of the subtle difference in date format strings between MySQL and SQLite

Postman reporting Unexpected 'N' error in response body

Adding extra shelves to the Ikea Detolf display cabinet

Recent Galleries

Space Food - Chocolate Ice Cream with Chocolate Chips

Legeod Star Wars AT-DP kit

DIY spare parts computer build with a RAIDMAX Anura case

Fake 'Lepin' brand Lego packaging

Hardwood garden bench with clear resin void filler

Fixing a 3D printer extruder that stopped heating up

Easily increase disk space in a Lenovo Ideapad 100S 14" laptop with an M.2 SSD

Making a multi-piece 3D printed solder spool holder stand

DIY indoor apartment grow light wiring

Good Friday Electronics fun Easter Bunny LED PCB Kit IBEABU-01.0

My Other Web Sites

Igor and Elise's Travels
Riverside Expressway Cam
300 George St Blogumentary

My Online Tools

UUID to OID Converter
Guru JSON-RPC Tester
Extrudifier Object Designer
Travel ┬ÁBlog

Blogs and Friends

Matt Moores Blog
Georgi's FlatPress Guide
Perplexing Permutations
The Security Sleuth
Ilia Rogatchevski
Travelling Fairy

Blog Activity

Blog Activity
Please follow me for more great content!
     
Don't show this again