Time and time zone issues In debian-Linux Release Technology-Debian information. See the following for details. In the Linuix system, the system time is determined by three factors: hardware time, UTC (/etc/default/rcS), and Timezone. The UTC option in/etc/default/rcS tells the Linux system whether the hardware time is UTC time. Timezone is used to set the system's UTC time zone (I am using Asia/Shanghai ). Finally, when the system starts, it reads the hardware time and calculates the system localtime based on whether it is UTC time and the Timezone in which the system is located.
The following is the time of the hardware clock.
DNAS :~ # Hwclock? Show
Wed 03 Oct 2007 09:40:10 pm cst-0.169539 seconds
Since I have Set UTC = no in/etc/default/rcS, I told the system that the hardware time is not UTC time. Then the system time will be determined based on the following two files:
/Etc/timezone
/Etc/localtime
Install ntpdate to synchronize time
Apt-get install ntpdate
Use tzconfig to set the time zone. Make sure it is Asia/shanghai.
In addition, debian/linux considers the BIOS time as World Time (UTC) by default ).
Modify/etc/default/rcS and change the UTC = yes option to UTC = no.
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