Check current timezone settings

date

output sample (JST timezone):

Thu May  5 18:54:29 JST 2022

Backup current timezone settings:

cp /etc/localtime /root/old.timezone

Update current timezone (to UTC)

rm /etc/localtime && ln -s /usr/share/zoneinfo/UTC /etc/localtime

Note: Any timezone from directory/subdirectory of /usr/share/zoneinfo/ can be used.