aubion.blogg.se - Linux setdate

#Linux setdate manual#
#Linux setdate software#
#Linux setdate iso#

The date command is fundamental to understanding time options on Linux. It may sound odd, but you must use the date command to see the time on Linux: $ date For example, how long does it take to recursively list all the files in a directory? $ time ls -Rl dir/* To start with, the time command on Linux doesn’t tell the time: $ timeīecause time is a timer for measuring how long a process runs. Any editor will work, but nano or vi is the normal choice.Telling the time on Linux is more complicated than it might seem at first glance.

You need to use sudo or su to edit this file.

In Debian the timezone for the hardware clock is configured in the file /etc/adjtime Įdit /etc/adjtime, and change "UTC" to "LOCAL" if you want the hardware clock to be kept at local time instead of UTC. To keep the hardware clock sane and the time correctly displayed by multiple systems they need to agree on which timezone the hardware clock is kept at. While Debian prefer to keep the hardware clock in UTC (this prevents the need to change it on daylight savings and timezone changes) other systems (like Windows) by default keeps the hardware clock synchronized to local time. Hardware clock and system time when dual booting eg CA for Canada etc.įor increased accuracy you would include extra server lines such as Click on the continent to see the valid country codes. Where XX is your continent or two letter country code. īecause the pool is global, you should adjust While there are still many independent NTP servers you can connect to, the best source is. Your ISP may provide a time service and this would be your closest and probably most accurate source. On the internet there are time servers that provide the correct time. Your local network may provide such a server but most people need to access an NTP server via the internet. To set the time automatically you need access to an NTP server. The protocol used to set the time is the Network Time Protocol or NTP. This is done by the script /etc/init.d/hwclock.sh. Modern Debian releases (2.2 and onwards) automatically save the system time to hardware clock on proper shutdowns, and set the system clock from hardware clock when they boot up.

#Linux setdate manual#

To write the current system time to the hardware clock so that it can be recovered on subsequent restarts of the system, correct the system time as above, then use the command hwclock -systohc to save it to hardware (see the hwclock manual page for more options). See also the time-admin program in gnome-system-tools package. Most desktop environments provide a date/time configuration utility. When the system boots, it has no concept of absolute time and will populate the system time with the date and time read from the hardware clock, thus to ensure that the time set using date is kept across reboots it has to be saved to the hardware clock.

#Linux setdate software#

software clock) but has no effect on the underlying hardware clock (aka. Note, using the date command only sets the runtime system time (aka. The above two commands set the system date to second of November, 1998, and system time to eight minutes past nine, PM.

#Linux setdate iso#

The -set argument examples below is specified in the ISO 8601 standard's extended format as YYYY-MM-DD for Year-Month-DayOfMonth, and time of day HH:MM:SS using 24 hour clock. You can read the man page of date, or use the example below for one possible and very useful format. However, when using the -set argument date accepts the date and time in many formats. When setting the system time manually using date directly, the required time specification format may be confusing (by POSIX convention has to be MMDDhhmmYYYY).

To see the time in the UTC timezone, use the command date -utc (or shorthand date -u). To see the time on a Debian GNU/Linux system, use the command date, without arguments it will show system time respecting the currently defined timezone.

Hardware clock and system time when dual booting.