Handling timezone in Spring Boot Wed, Aug 28, 2019

LocalDateTime vs ZonedDateTime

• LocalDateTime: Time based on system timezone

• ZonedDateTime: Time based on system or user-defined timezone

  LocalDateTime.now();                                 // 2020-03-02T06:48:56.623993
  ZonedDateTime.now();                                 // 2020-03-02T06:48:56.616338Z[Etc/UTC]
  
  ZonedDateTime.now().withZoneSameInstant(memberZone); // 2020-03-02T15:48:56.619674+09:00[Asia/Seoul]
  ZonedDateTime.now(memberZone);                       // 2020-03-02T15:48:56.622355+09:00[Asia/Seoul]
  LocalDateTime.now(memberZone);                       // 2020-03-02T15:48:56.625316
  

• memberZone = Asia/Seoul

• System = UTC