Linux系统下查看和修改 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
查看网上时间：/shijian/
设置系统时间
[root@littlelawson hbase-1.4.0]# date -s 21:48:00
Mon Jun 18 21:48:00 PDT
写入时间：
clock –w
查看当前硬件时间
[root@littlelawson hbase-1.4.0]# hwclock
Mon 18 Jun 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 21:50:01'
[root@littlelawson hbase-1.4.0]# hwclock --systohc
[root@littlelawson hbase-1.4.0]# hwclock
daMon 18 Jun 09:52:23 PM PDT -0.391427 seconds
[root@littlelawson hbase-1.4.0]# date
Mon Jun 18 21:52:23 PDT
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
3，以常见的格式输出
[root@root ~]# date "+%Y-%m-%d %H:%M:%S"
-02-19 13:14:19
