如何在 MySQL 選擇查詢中將 UTC 日期轉換為本機時區？

Converting UTC Dates to Local Time Zones in MySQL Select Queries

Question:

How can I modify a MySQL query to convert a UTC timestamp column, "displaytime," into the local time zone?

Answer 1:

Use the CONVERT_TZ() function as follows:

SELECT CONVERT_TZ(displaytime, 'GMT', 'MET');

Answer 2:

Ensure that your timezone tables are initialized. Use the mysql_tzinfo_to_sql program to populate them:

shell> mysql_tzinfo_to_sql /usr/share/zoneinfo

Once initialized, you can use the CONVERT_TZ() function as described above.

Additional Notes:

• Check your timezone-related tables using the following queries:

SELECT * FROM mysql.time_zone;
SELECT * FROM mysql.time_zone_name;

• If they are empty, you need to initialize them as described above.
• Ensure that your column type is either timestamp or date for the CONVERT_TZ() function to work correctly.
• Specify the time zones in the CONVERT_TZ() function as either +HH:MM (for positive offsets from UTC) or -HH:MM (for negative offsets). For example, +00:00 for UTC and +04:00 for Moscow Standard Time.

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