Jang Haemin

Results 2 issues of Jang Haemin

### Description ### What is the purpose of this pull request? - [ ] Bug fix - [ ] New Feature - [x] Documentation update - [ ] Other

## Bug description The OS and MySQL time both are set to KST(Korea Standard Time) which is UTC+9:00. But when create or update records with `new Date()`, `DATETIME` string doesn't...

bug/2-confirmed
kind/bug
topic: dates / DateTime
topic: mysql
domain/client
topic: postgresql
topic: timezone logic related