Detailed Date command

The date command displays dates or sets the system date using the specified format.

Command format:

Date [Options] ... [+ format]
Or: Date [-u|--utc|--universal] [MMDDHHMM[[CC]YY][.SS]]

• Show Current Time

#显示当前日期, my Linux installation is using the Chinese encoding, so the display is Chinese

[Root@localhost ~] #date

Sunday, October 04, 2015 01:38:07 CST

#以指定格式显示当前日期的小时, the date format is shown in the following section of the article, showing only know +%h for hours

[root@localhost ~] #date +%h

01

• Displays the date of the specified string description

#显示2015-05-25 Represents the date

[Root@localhost ~]# date-d 2014-05-02

Friday, May 02, 2014 00:00:00 CST

[Root@localhost ~]# Date--date=2015-05-25

Monday, May 25, 2015 00:00:00 CST

• Setting the system time

# "" means space character,-S 2015-10-03 "" 18:17:00 set 2015-10-03 18:17:00 for system time

#使用 +%y-%m-%d% ""%h:%m:%s specifies the date format for the 2015-10-03 18:17:00

[Root@localhost ~]# date-s 2015-10-03 "" 18:17:00 +%y-%m-%d% ""%h:%m:%s

2015-10-03% 18:17:00

#使用长命令方式设置

[[Email protected] ~]# date--set=2015-10-03 "" 18:17:00 +%y-%m-%d% ""%h:%m:%s

2015-10-03% 18:17:00

• Read the date row by line from the file

#以下是文件中的内容

2015-10-03 18:17:00

2015-10-03 18:19:00

2015-10-03 18:20:00

#逐行读取日期字符串并输出

[Email protected] ~]# date-f test

Saturday, October 03, 2015 18:17:00 CST

Saturday, October 03, 2015 18:19:00 CST

Saturday, October 03, 2015 18:20:00 CST

[Email protected] ~]# date--file=test

Saturday, October 03, 2015 18:17:00 CST

Saturday, October 03, 2015 18:19:00 CST

Saturday, October 03, 2015 18:20:00 CST

• Displays the last modified time of the file

[Email protected] ~]# date-r test

Saturday, October 03, 2015 19:40:38 CST

[Email protected] ~]# date--reference=test

Saturday, October 03, 2015 19:40:38 CST

• Other uses

#以RFC 2822 Format output date and time

[Email protected] ~]# date-r

Sat, OCT 2015 20:44:49 +0800

[Email protected] ~]# date--rfc-2822

Sat, OCT 2015 20:45:14 +0800

#以RFC 3339 Format output date and time

#TIMESPEC = ' Date ', ' seconds ', or ' ns '

#表示日期和时间的显示精度.

#日期和时间单元由单个的空格分开:

[Email protected] ~]# date--rfc-3339=date

2015-10-03

[Email protected] ~]# date--rfc-3339=seconds

2015-10-03 20:49:17+08:00

[Email protected] ~]# date--rfc-3339=ns

2015-10-03 20:49:22.762993721+08:00

#设置或输出协调通用时间

[Email protected] ~]# Date-u

Saturday, October 03, 2015 12:51:59 UTC

#显示帮助信息

[Email protected] ~]# date--help

#显示版本信息

[Email protected] ~]# date--version

• Common date formats

#显示当前时间的年份, + indicates that this is a date format,% is a fixed format, Y represents the four-digit year of the fetch date, and Y represents the post two-digit year

[Email protected] ~]# date +%y

2015

[Email protected] ~]# date +%y

15

#显示指定字符串表示的时间的月份 (01-12)

[Email protected] ~]# date-d 2015-05-20 +%m

05

#显示指定字符串表示的时间的日期

[Email protected] ~]# date-d 2015-05-01 +%d

01

#显示指定字符串表示的时间的日期, leading petty space padding

[Email protected] ~]# date-d 2015-05-01 +%_d

1

#完整日期格式, equivalent to%y-%m-%d

[Email protected] ~]# date-d 2015-05-01 +%f

2015-05-01

#显示小时 (0-23)

[Email protected] ~]# date-d 2015-05-01 "" 13:25:00 +%k

13

#显示小时 (1-12)

[Email protected] ~]# date-d 2015-05-01 "" 13:25:00 +%l

1

#显示小时 (00-23)

[Email protected] ~]# date-d 2015-05-01 "" 13:25:00 +%h

13

#显示小时 (00-12)

[Email protected] ~]# date-d 2015-05-01 "" 13:25:00 +%i

01

#显示分钟 (00-59)

[Email protected] ~]# date-d 2015-05-01 "" 13:25:00 +%m

25

#显示秒 (00-60)

[Email protected] ~]# date-d 2015-05-01 "" 13:25:00 +%s

00

Other formats can be viewed using--HELP.

Detailed Date command