java - What Is A Difference Between CET And Europe/Prague?

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65880455/what-is-a-difference-between-cet-and-europe-prague

Answer 1

According to the MySQL Server Time Zone Support, MySQL has a table that maps from (known) timezone names to timezones. Depending on the OS, this table may be populated from the OS's timezone database ... or from some other source.

So the reason for "Europe/Prague" working and "CET" not working is most likely that the OS's timezone database doesn't recognize "CET" as a timezone name.

Note that the 3 (or 4) letter time zone names are often ambiguous and it is best to avoid using them. For example CST can mean "China Standard Time", "Cuba Standard Time" or "Central Standard Time" ... which are 3 different zones.