Please execute the “date” command in order to see the current time and date settings
[root@racnode-2 ~]# date
Thu Aug 14 17:49:04 BDT 2008
So current time is month 8 day 17, year 2008, time 17:49:04.
Now to change only time to 11:51.30 execute
[root@racnode-2 ~]# date 08141151.30
Thu Aug 14 11:51:30 BDT 2008
[root@racnode-2 ~]# date
Thu Aug 14 11:51:32 BDT 2008
Note that setting date in this way will not cause the date to remain after a reboot. The date command sets the Linux system clock which is separate from the hardware clock.
We can check linux hardware clock by,
[root@racnode-2 ~]# hwclock
Thu 14 Aug 2008 05:57:01 PM BDT -0.788181 seconds
To make date setting persistent update the hardware clock with the date from the Linux system clock.
[root@racnode-2 ~]# /sbin/hwclock --systohc
If you are using universal time then use,
hwclock --utc --systohc
An alternative way is if you want to set the hardware(BIOS) clock so the system will keep the time when it reboots using,
clock -w
or
setclock
after changing date and time by date command.
To set date and time we can also use,
# date -s "2 OCT 2008 8:00:00"
If you wanted to change the year as well, for example to change year to 2007 of 30th April time 11:16pm you could type
#date 043023162007
To change only the time to 10:10 am you also can use,
#date -s 10:10
Using NTP (Network Time Protocol)
This is simple process. Just adding the time server to /etc/ntp.conf and to /etc/ntp/step-tickers Here I use time server as 192.168.1.91.
#vi /etc/ntp.conf
server 192.168.1.91
#vi /etc/ntp/step-tickers
192.168.1.91
Then of course make sure that ntp will start at boot time by,
chkconfig --level 2345 ntpd on
chkconfig --list ntpd
And let's start the service now by,
service ntpd start
It will display output as
ntpd: Synchronizing with time server: [ OK ]
Starting ntpd: [ OK ]
Posted by Arju at 10:53 PM
Labels: How to change date and time on Linux using hand and NTP
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