Unix: Date & time
Gnu/Linux provides commands that let you set the current system date and time and the system time zone.
To display the current system time, enter the date command:
$ date Sun Mar 16 09:28:22 CEST 2014
To set the system time, you specify the new time using the
MM is month,
DD is day of the month,
hh is hour,
mm is minute,
YYYY is year,
ss us second. (the year and second are optional).
# date 031609282014.22 Sun Mar 16 09:28:22 CEST 2014
When you power down or reboot your system, the system date & time will revert to the date & time values held in non-volatile (CMOS) memory. If this clock is wrong, the system date & time will be wrong after a reboot.
To store the current system date and time in CMOS, issue the following command:
# hwclock --systohc
The current system timezone is a string that is stored in a file
/etc/timezone. To inspect the timezone, list this
# cat /etc/timezone Europe/Oslo
To set the time zone, write a new valid string to this file, and use the command dpkg-reconfigure to set it noninteractively.
# echo "Europe/Oslo" > /etc/timezone # dpkg-reconfigure -f noninteractive tzdata
Be aware that running processes may not pick up the change without a restart. In particular: log timestamps from server daemons are likely to be wrong until you restart the daemons.
||print or set system date & time|
||query or set the hardware clock|