Linux Time

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我们一般使用“date -s”命令来修改系统时间。比如将系统时间设定成2005年7月26日的命令如下。

#date -s 07/26/2005
　　
将系统时间设定成下午11点12分0秒的命令如下。
　　
#date -s 11:12:00
 
由于该同步是每隔一段时间（大约是11分钟）进行的，在我们执行date -s后，如果马上重起机器，修改时间就有可能没有被写入CMOS,这就是问题的原因。如果要确保修改生效可以执行如下命令。
#clock -w

这个命令强制把系统时间写入CMOS。
 
Modify Timezone 时区
Timezone File Path：/usr/share/zoneinfo
Shanghai：/usr/share/zoneinfo/Asia/Shanghai
Auckland: /usr/share/zoneinfo/Pacific/Auckland
 
Modify Steps for changing to Auckland timezone：
1. Replace file: cp /usr/share/zoneinfo/Pacific/Auckland /etc/localtime
2. Check: date
3. Write into BIOS: hwclock -w
4. Restart system

Check file: /etc/sysconfig/clock

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