How can I get a comprehensive list of MySQL time zones?

MySQL Time Zones: An Exhaustive Guide

Question: Is there a comprehensive list of available MySQL time zones?

Answer: Yes, but it varies depending on the host operating system. To access the list, you need to load time zone data into MySQL.

How to Load Time Zone Data:

mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql

Note: This command is for Unix systems; the equivalent for Windows is not known.

Listing Time Zones:

Once the data is loaded, you can view the list of time zones:

USE mysql;
SELECT * FROM `time_zone_name`;

Calgary Local Time:

To display the time in Calgary's local time, use the following syntax:

SELECT CONVERT_TZ(CURRENT_TIMESTAMP, 'GMT', 'America/Edmonton');

Additional Notes:

• The time zone data takes up approximately 5 MB in MySQL.
• To unload the data, execute the following commands and restart MySQL:

TRUNCATE `time_zone` ;
TRUNCATE `time_zone_leap_second` ;
TRUNCATE `time_zone_name` ;
TRUNCATE `time_zone_transition` ;
TRUNCATE `time_zone_transition_type` ;

• Caution: Do not drop these tables, as it will cause issues.

Automated Time Zone Updates:

You can set up an automated system to update MySQL time zones when the system time zone changes.

For MySQL >= 5.6.6:

mysql_config_editor set --login-path=client --host=localhost --user=root --password

For MySQL

Create a ~/.my.cnf file with the following contents:

[client]
user=root
password=yourMysqlRootPW

Then, add the following script to crontab to run daily:

if [ `find /usr/share/zoneinfo -mtime -1 | grep -v '\.tab' | wc -l` -gt 0 ]; then
    echo "Updating MySQL timezone info"
    mysql_tzinfo_to_sql /usr/share/zoneinfo 2>/dev/null | mysql -u root mysql
    echo "Done!\n"
fi

Remember, this is mostly untested. If you encounter any issues, report them to update the answer accordingly.

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