참고자료: https://mosei.tistory.com/entry/AWS-EC2-Linux-서버-한국표준시간으로-변경하기?category=1189099

[ec2-user@ip-172-31-53-183 ~]$ sudo su
[root@ip-172-31-53-183 ec2-user]# sudo rm /etc/localtime
[root@ip-172-31-53-183 ec2-user]# sudo ln -s /usr/share/zoneinfo/Asia/Seoul /etc/localtime
[root@ip-172-31-53-183 ec2-user]# date
2022. 06. 25. (토) 23:48:23 KST
[root@ip-172-31-53-183 ec2-user]# sudo vi /etc/sysconfig/clock
[root@ip-172-31-53-183 ec2-user]# date
2022. 06. 25. (토) 23:49:46 KST