Adjust Daylight Saving Time - Red Hat/CentOS

Adjust Daylight Saving Time - Red Hat/CentOS - Create the file in anywhere:

 # vi Sao_Paulo.zic 

 

Rule    BrazilSP  2018    only    -       Nov     04      0:00    1:00    S
Rule    BrazilSP  2019    only    -       Feb     17      0:00    0       -

# Zone  NAME                    GMTOFF  RULES/SAVE      FORMAT  [UNTIL]
Zone    America/Sao_Paulo       -3:00   BrazilSP        BR%sT

 # zic  Sao_Paulo.zic 

- Check out if the daylight time interval changed in the timezone:

 # zdump -v /usr/share/zoneinfo/America/Sao_Paulo | grep 2018 

- Create a link symbolic

 # ln -sf /usr/share/zoneinfo/America/Sao_Paulo /etc/localtime 

 # env | grep TZ 

- Type the timezone to be used:

 # vi /etc/profile 

 # export TZ=America/Sao_Paulo 

 # source /etc/profile 

Done!! Check if the Daylight is being displayed right!!

Not found ifconfig in CentOS?

Don't worry, if you have installed your CentOS/RedHat using minimal mode. The OS comes lightly without some of well-known binaries. Following how to install some of these necessary admin programs via yum:

1 - ifconfig:

# yum install net-tools

2 - killall:

yum install psmisc

3 - snmpwalk:

yum install net-snmp-utils