Every system has a clock and is a critical component of the Operating System. It keep the time, which is used for various proposes such as:<\/p>\n
<\/p>\n
The commonly command and its switches used to view and manage the time configured in a system are as follows:<\/p>\n
[root@centos9vm ~]#<\/strong> timedatectl The below command will help to identify the Time Zones that can be configured on this system<\/p>\n [root@centos9vm ~]#<\/strong> tzselect<\/p>\n ===== ===<\/em> Enter the selection: 2<\/em> Enter the selection:\u00a049<\/em> Enter the selection: 1<\/em> United States<\/em> Now let us configure a new TimeZone using the timedatectl command<\/p>\n [root@centos9vm ~]#<\/strong> timedatectl set-timezone America\/New_York<\/p>\n If the\u00a0timedatectl<\/strong> command shows a line as below, that means NTP time synchronization is enabled<\/p>\n NTP service: active<\/em><\/p>\n Now let us try to change the date configured in the system. For this we will have to disable NTP time synchronization first<\/p>\n [root@centos9vm ~]#<\/strong> timedatectl set-ntp false [root@centos9vm ~]#<\/strong> timedatectl [root@centos9vm ~]#<\/strong> timedatectl set-ntp true As the NTP is enabled, let us see the NTP server that is used<\/p>\n [root@centos9vm ~]#<\/strong> chronyc sources -v<\/p>\n ====== ===<\/em> ^+ time.cloudflare.com 3 6 377 35 -3621us[-3542us] +\/- 48ms<\/em> The NTP server is configured in the file\u00a0\/etc\/chrony.conf<\/em><\/p>\n [root@centos9vm ~]# cat \/etc\/chrony.conf<\/p>\n =====<\/em>
\n=========<\/em>
\n Local time: Sun 2024-06-30 06:48:38 IST<\/em>
\n Universal time: Sun 2024-06-30 01:18:38 UTC<\/em>
\n RTC time: Sun 2024-06-30 01:18:38<\/em>
\n Time zone: Asia\/Kolkata (IST, +0530)<\/em>
\nSystem clock synchronized: yes<\/em>
\n NTP service: active<\/em>
\n RTC in local TZ: no<\/em>
\n==========<\/em><\/p>\n
\nPlease identify a location so that time zone rules can be set correctly.<\/em>
\nPlease select a continent, ocean, “coord”, or “TZ”.<\/em>
\n1) Africa\u00a02) Americas 3)……<\/em><\/p>\n
\nPlease select a country whose clocks agree with yours.<\/em>
\n1) Anguilla\u00a0 2)….\u00a049) United States<\/em><\/p>\n
\nPlease select one of the following timezones.<\/em>
\n1) Eastern (most areas)\u00a0 ….\u00a0\u00a029) Hawaii<\/em><\/p>\n
\nThe following information has been given:<\/em><\/p>\n
\n Eastern (most areas)<\/em>
\nTherefore TZ=’America\/New_York’ will be used.<\/em>
\n===== ==<\/em><\/p>\n
\n[root@centos9vm ~]#<\/strong> timedatectl set-time 2022-10-22<\/p>\n
\nLocal time: Sat 2022-10-22 00:00:09 EDT<\/em>
\n………<\/em>
\n==== ==<\/em><\/p>\n
\n[root@centos9vm ~]#<\/strong> timedatectl
\nLocal time: Sun 2024-06-30 05:21:27 EDT<\/em>
\n====== ===<\/em><\/p>\n
\nMS Name\/IP address Stratum Poll Reach LastRx Last sample<\/em><\/p>\n
\n^- ntp.qntmnet.com 2 6 377 37 -7921us[-7843us] +\/- 104ms<\/em>
\n===== ==<\/em><\/p>\n
\npool 2.centos.pool.ntp.org iburst<\/strong><\/em>
\n=======<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"