You set up a machine – but you set the wrong timezone, how to fix it?

First confirm the current timezone

[root@mysystem ~]# date
Mon Jun 3 09:08:58 CDT 2019

We will use the tool timedatect to change it. Now – we need to find the correct zone to use. We can list the available zones by using the command

[root@mysystem ~]# timedatectl list-timezones

but we will end up with a huge long list – so to narrow things down, we will use the command:

[root@mysystem ~]# timedatectl list-timezones | grep America
America/Adak
America/Anchorage
America/Anguilla
America/Antigua
America/Araguaina
America/Argentina/Buenos_Aires
America/Argentina/Catamarca
America/Argentina/Cordoba
America/Argentina/Jujuy
America/Argentina/La_Rioja
America/Argentina/Mendoza
America/Argentina/Rio_Gallegos
America/Argentina/Salta
America/Argentina/San_Juan
(and many more after this)

The one I need is America/New_York so now I will issue the command:

[root@mysystem ~]# timedatectl set-timezone America/New_York
[root@mysystem ~]# date
Mon Jun 3 10:15:13 EDT 2019

and now I am in EDT!!