在安装Linux操作系统时，有一个选项是UTC，默认是勾上的。系统安装好后会把BIOS时间当成UTC标准时间，然后再根据时区调整系统时间。所以会发生明明时区设置正确，时间却不正确的情况。所以安装时，最好是取消那个勾。
如果已经装好，可以通过修改配置文件的方式修改。
redhat系统 修改/etc/adjtime第三行为LOCAL
[root@db-01 ~]# vim /etc/adjtime
-0.098726 1524046105 0.000000
1524046105
LOCAL
~
The format of the adjtime file is, in ASCII:
Line 1: 3 numbers, separated by blanks: 1) systematic drift rate in seconds per day, floating
point decimal; 2) Resulting number of seconds since 1969 UTC of most recent adjustment or cali-
bration, decimal integer; 3) zero (for compatibility with clock(8)) as a decimal integer.
Line 2: 1 number: Resulting number of seconds since 1969 UTC of most recent calibration. Zero
if there has been no calibration yet or it is known that any previous calibration is moot (for
example, because the Hardware Clock has been found, since that calibration, not to contain a
valid time). This is a decimal integer.
Line 3: "UTC" or "LOCAL". Tells whether the Hardware Clock is set to Coordinated Universal
Time or local time. You can always override this value with options on the hwclock command
line.
You can use an adjtime file that was previously used with the clock(8) program with hwclock.
修改时区的方法
修改配置文件/etc/sysconfig/clock
更新时区tzdata-update
ubuntu系统
hwclock的时区在/etc/default/rcS文件中设置，里面有一个参数UTC，默认值为True，表示使用UTC时 区，如果设置为no，那表示使用osclock的时区