I had this Error in my Spring Boot application: org.postgresql.util.PSQLException: FATAL: invalid value for parameter "TimeZone": "Europe/Kiev". My stack is Windows 11 / 10

PostgreSQL remote (somewhere with old tzdata )

JDBC driver 42.5.5

Spring Boot 3.2.2

HikariCP 5.0.1 . I found that I have to put this → -Duser.timezone=Europe/Kyiv. in VM options in Run/Debug configurations. Now work brilliant.