# Linux服务器时间设置及同步

### [**1 手动设置**](http://blog.csdn.net/jesseyoung/article/details/43488351)

date命令：\
date :查看当前时间，结果如下：Wed Feb 4 16:29:51 CST 2015\
date -s 16:30:00 :设置当前时间，结果如下：Wed Feb 4 16:30:00 CST 2015\
date -s "YYYY-MM-DD hh:mm\[:ss]" 如date -s "2015-02-04 16:30:00"\
hwclock -w（将时间写入bios避免重启失效）

### 2.

ntpdate命令：\
ntpdate -u 210.72.145.44

注意：若不加上-u参数， 会出现以下提示：no server suitable for synchronization found\
-u：从man ntpdate中可以看出-u参数可以越过防火墙与主机同步；\
210.72.145.44：中国国家授时中心的官方服务器。

ntp常用服务器：\
中国国家授时中心：210.72.145.44\
NTP服务器(上海) ：ntp.api.bz\
美国：time.nist.gov\
复旦：ntp.fudan.edu.cn\
微软公司授时主机(美国) ：time.windows.com\
台警大授时中心(台湾)：asia.pool.ntp.org

经测试中国国家授时中心与NTP上海服务器可以正常同步时间，注意需要加上-u参数！***\****[***3 时区修改***](http://blog.csdn.net/jesseyoung/article/details/43488351)***\****\
**3.1 即时生效**

```crystal
    [root@localhost /]# cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
    [root@localhost /]# hwclock
```

**3.2 重启生效**\
修改/etc/sysconfig/clock文件，把ZONE的值改为Asia/Shanghai，UTC值改为false，改完后的文件如下：

```ruby
# The time zone of the system is defined by the contents of /etc/localtime.
# This file is only for evaluation by system-config-date, do not rely on its
# contents elsewhere.
ZONE="Asia/Shanghai"
UTC=false
ARC=false
```


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