Linux Administration - Time

Date
Commands 

 date
Displays current date/time.

 date 103123302007
Sets the current time 11:30pm on October 31, 2007.

 hwclock --systohc
Synchronize hardware clock to the software clock.

 hwclock --hctosys
Synchronize software clock to the hardware clock.

NTP
Files 

/etc/ntp.conf		- configuration file
/var/lib/ntp		- ntp files
/var/lib/ntp/ntp.drift	- file used to correct time drifting

Commands 
 /etc/init.d/ntpd restart
Restart ntp daemon via SysV script.

 ntpq
Ntp status program.

 ntpdate [host] (deprecated)
> ntpd -g
After the main NTP servers has been configured, point other clients in network to them.

Timezones
Files 

/etc/localtime		- local time zone information
/etc/timezone		- sometimes is also called this
/usr/share/zoneinfo	- timezone files