Linux系统下查看系统时间和硬件时间
1.具体命令使用如下：
查看当前系统时间
[root@littlelawson hbase-1.4.0]# date
Mon Jun 18 10:36:45 PDT 2018

设置系统时间
[root@littlelawson hbase-1.4.0]# date -s 21:48:00
Mon Jun 18 21:48:00 PDT 2018

查看当前硬件时间
[root@littlelawson hbase-1.4.0]# hwclock
Mon 18 Jun 2018 09:51:01 PM PDT -0.969901 seconds

设置硬件时间，‘月/日/年 时分’
[root@littlelawson hbase-1.4.0]# hwclock –set –date=‘06/18/18 21:50’

[root@littlelawson hbase-1.4.0]# hwclock –systohc

[root@littlelawson hbase-1.4.0]# hwclock
daMon 18 Jun 2018 09:52:23 PM PDT -0.391427 seconds

[root@littlelawson hbase-1.4.0]# date
Mon Jun 18 21:52:23 PDT 2018
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2.关于hwclock[hardware clock]命令
-s, –hctosys
Set the System Time from the Hardware Clock.#以硬件时间为标准，设置系统时间
Also set the kernel’s timezone value to the local timezone as
indicated by the TZ environment variable and/or
/usr/share/zoneinfo, as tzset(3) would interpret them. The
obsolete tz_dsttime field of the kernel’s timezone value is
set to DST_NONE. (For details on what this field used to
mean, see settimeofday(2).)

          This  is  a  good  option to use in one of the system startup
          scripts.

   -w, --systohc
          Set the Hardware Clock to the current System Time.##以系统时间为标准，设置硬件时间