Update Time and Date Linux

• First verify your time by typing in:

o #timedatectl

• Set NTP or Disable

o #timedatectl set-ntp yes

o #timedatectl set-ntp no

• Set Timezones

o #timedatectl set-timezone UTC

o #timedatectl set-local-rtc 1(YOUR_LOCAL_TIMEZONE)

• Change the Clock

o #timedatectl set-time HH:MM:SS

o #timedatectl set-time YYYY-MM-DD

• List Timezones

o #timedatectl list-timezones

o #timedatectl list-timezones | grep keyword(Time-Zone)

• Set Hardware Clock to Sync with UTC

o #timdatectl set-local-rtc 0

• Display the Hardware Clock (Older Ubuntu Versions)

o #sudo hwclock -r

o #sudo hwclock --show

o #sudo hwclock --show --verbose

• Display the date and change the date/time (Older Ubuntu Versions)

o #date (display)

o #sudo date -s YY-MM-DD HH:MM:SS

Setting the Clock on Cisco Device

1. You can set the main clock from EXEC privileged mode. The following is the syntax:
a. Clock set “hh:mm:ss” “day month year”
b. Example: “clock set 22:21:20 1 June 2017”
2. After you set it, you can verify by typing “show clock”.