How to Set or Change Timezone on Debian 10

$ timedatectl                                           
               Local time: Thu 2021-02-18 21:18:37 EST  
           Universal time: Fri 2021-02-19 02:18:37 UTC  
                 RTC time: Fri 2021-02-19 02:18:38      
                Time zone: America/New_York (EST, -0500)
System clock synchronized: yes                                
              NTP service: active                             
          RTC in local TZ: no    $ timedatectl list-timezones
Asia/Phnom_Penh

$ sudo timedatectl set-timezone Asia/Phnom_Penh

$ timedatectl                                             
               Local time: Fri 2021-02-19 09:20:33 +07 
           Universal time: Fri 2021-02-19 02:20:33 UTC 
                 RTC time: Fri 2021-02-19 02:20:34     
                Time zone: Asia/Phnom_Penh (+07, +0700)
System clock synchronized: yes                         
              NTP service: active                      
          RTC in local TZ: no
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