日期时间相关命令

1 [root@VM_0_3_centos ~]# date
2 Mon Mar 18 19:13:33 CST 2019
3 [root@VM_0_3_centos ~]# 

 1 [root@VM_0_3_centos ~]# date --help
 2 Usage: date [OPTION]... [+FORMAT]
 3   or:  date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
 4 Display the current time in the given FORMAT, or set the system date.
 5 
 6   -d, --date=STRING         display time described by STRING, not `now‘
 7   -f, --file=DATEFILE       like --date once for each line of DATEFILE
 8   -r, --reference=FILE      display the last modification time of FILE
 9   -R, --rfc-2822            output date and time in RFC 2822 format.
10                             Example: Mon, 07 Aug 2006 12:34:56 -0600
11       --rfc-3339=TIMESPEC   output date and time in RFC 3339 format.
12                             TIMESPEC=`date‘, `seconds‘, or `ns‘ for
13                             date and time to the indicated precision.
14                             Date and time components are separated by
15                             a single space: 2006-08-07 12:34:56-06:00
16   -s, --set=STRING          set time described by STRING
17   -u, --utc, --universal    print or set Coordinated Universal Time
18       --help     display this help and exit
19       --version  output version information and exit