한국어

네트워킹

온누리070 플레이스토어 다운로드
    acrobits softphone
     온누리 070 카카오 프러스 친구추가온누리 070 카카오 프러스 친구추가친추
     카카오톡 채팅 상담 카카오톡 채팅 상담카톡
    
     라인상담
     라인으로 공유

     페북공유

   ◎위챗 : speedseoul


  
     PAYPAL
     
     PRICE
     

pixel.gif

    before pay call 0088 from app


https://library.linode.com/linux-tools/common-commands/date

Date command is helpful to display date in several formats. It also allows you to set systems date and time.

This article explains few examples on how to use date command with practical examples.

When you execute date command without any option, it will display the current date and time as shown below.

$ date
Mon May 20 22:02:24 PDT 2013

1. Display Date from a String Value using –date Option

If you have a static date or time value in a string, you can use -d or –date option to convert the input string into date format as shown below.

Please note that this doesn’t use the current date and time value. Instead is uses the date and time value that you pass as string.

The following examples takes an input date only string, and displays the output in date format. If you don’t specify time, it uses 00:00:00 for time.

$ date --date="12/2/2014"
Tue Dec  2 00:00:00 PST 2014

$ date --date="2 Feb 2014"
Sun Feb  2 00:00:00 PST 2014

$ date --date="Feb 2 2014"
Sun Feb  2 00:00:00 PST 2014

The following example takes an input date and time string, and displays the output in date format.

$ date --date="Feb 2 2014 13:12:10"
Sun Feb  2 13:12:10 PST 2014

2. Read Date Patterns from a file using –file option

This is similar to the -d or –date option that we discussed above. But, you can do it for multiple date strings. If you have a file that contains various static date strings, you can use -f or –file option as shown below.


In this example, we can see that datefile contained 2 date strings. Each line of datefile is parsed by date command and date is outputted for each line.

$ cat datefile
Sept 9 1986
Aug 23 1987

$ date --file=datefile
Tue Sep  9 00:00:00 PDT 1986
Sun Aug 23 00:00:00 PDT 1987

3. Get Relative Date Using –date option

You can also use date command to get a future date using relative values.

For example, the following examples gets date of next Monday.

$ date --date="next mon"
Mon May 27 00:00:00 PDT 2013

If string=@is given to date command, then date command convert seconds since the epoch (1970-01-01 UTC) to a date.

It displays date in which 5 seconds are elapsed since epoch 1970-01-01 UTC:

$ date --date=@5
Wed Dec 31 16:00:05 PST 1969

It displays date in which 10 seconds are elapsed since epoch 1970-01-01 UTC:

$ date --date=@10
Wed Dec 31 16:00:10 PST 1969

It displays date in which 1 minute (i.e. 60 seconds) is elapsed since epoch 1970-01-01 UTC:

$ date --date=@60
Wed Dec 31 16:01:00 PST 1969

4. Display Past Date

You can display a past date using the -date command. Few possibilities are shown below.

$ date --date='3 seconds ago'
Mon May 20 21:59:20 PDT 2013

$ date --date="1 day ago"
Sun May 19 21:59:36 PDT 2013

$ date --date="yesterday"
Sun May 19 22:00:26 PDT 2013

$ date --date="1 month ago"
Sat Apr 20 21:59:58 PDT 2013

$ date --date="1 year ago"
Sun May 20 22:00:09 PDT 2012

5. Set Date and Time using –set option

You can set date and time of your system using -s or –set option as shown below..

In this example, initially it displayed the time as 20:09:31. We then used date command to change it to 21:00:00.

$ date
Sun May 20 20:09:31 PDT 2013

$ date -s "Sun May 20 21:00:00 PDT 2013"
Sun May 20 21:00:00 PDT 2013

$ date
Sun May 20 21:00:05 PDT 2013

5. Display Universal Time using -u option

You can display date in UTC format using -u, or –utc, or –universal option as shown below.

$ date
Mon May 20 22:07:53 PDT 2013

$ date -u
Tue May 21 05:07:55 UTC 2013

6. Display Last Modification Time using -r option

In this example, the current time is 20:25:48

$ date
Sun May 20 20:25:48 PDT 2013

The timestamp of datefile is changed using touch command. This was done few seconds after the above date command’s output.

$ touch datefile

The current time after the above touch command is 20:26:12

$ date
Sun May 20 20:26:12 PDT 2013

Finally, use the date command -r option to display the last modified timestamp of a file as shown below. In this example, it displays last modified time of datefile as 20:25:57. It is somewhere between 20:25:48 and 20:26:12 (which is when we execute the above touch command to modify the timestamp).

$ date -r datefile
Sun May 20 20:25:57 PDT 2013

7. Various Date Command Formats

You can use formatting option to display date command in various formats using the following syntax:

$ date +%<format-option>

The following table displays various date command formatting options.

Format optionsPurpose of OptionOutput
date +%aDisplays Weekday name in short (like Mon, Tue, Wed)Thu
date +%ADisplays Weekday name in full short (like Monday, Tuesday)Thursday
date +%bDisplays Month name in short (like Jan, Feb, Mar )Feb
date +%BDisplays Month name in full short (like January, February)February
date +%dDisplays Day of month (e.g., 01)07
date +%DDisplays Current Date; shown in MM/DD/YY02/07/13
date +%FDisplays Date; shown in YYYY-MM-DD2013-02-07
date +%HDisplays hour in (00..23) format23
date +%IDisplays hour (01..12) format11
date +%jDisplays day of year (001..366)038
date +%mDisplays month (01..12)02
date +%MDisplays minute (00..59)44
date +%SDisplays second (00..60)17
date +%NDisplays nanoseconds (000000000..999999999)573587606
date +%TDisplays time; shown as HH:MM:SS
Note: Hours in 24 Format
23:44:17
date +%uDisplays day of week (1..7); 1 is Monday4
date +%UDisplays week number of year, with Sunday as first day of week (00..53)05
date +%YDisplays full year i.e. YYYY2013
date +%Zalphabetic time zone abbreviation (e.g., EDT)IS
조회 수 :
20502
등록일 :
2013.07.11
10:31:00 (*.160.41.148)
엮인글 :
http://webs.co.kr/index.php?document_srl=21554&act=trackback&key=c25
게시글 주소 :
http://webs.co.kr/index.php?document_srl=21554
List of Articles
번호 제목 글쓴이 날짜 조회 수sort
121 Site builder shootout: Drupal vs. Joomla vs. WordPress admin 2012-07-15 83526
120 리눅스 시스템 시작시에 자동 실행할 파일 등록하기 admin 2014-03-22 83256
119 리눅스에 RADIUS 서버 구현하기 admin 2012-09-01 80490
118 [linux]리눅스 버전및 CPU등 환경정보 확인하기 admin 2013-04-08 79183
117 tar로 전체시스템 백업 LINUX Backup admin 2013-04-04 64554
116 Ubuntu 14.04 원격 접속(xrdp) 설정 admin 2014-12-21 55157
115 CentOS 5.4에서 RADIUS 서버 설치하기 admin 2013-04-19 50891
114 FreeRADIUS 설치(freeradius-sever-2.1.8) admin 2013-04-19 50574
113 리눅스 서버 이전시 고려할 사항들 admin 2011-12-16 43376
112 Getting started with SSH public key cryptography admin 2013-09-05 40177
111 linux 에티터 명령어 정리 포그라운드 전환 : ctrl + z 다시 vi 모드로 돌아오려면 fg admin 2014-03-05 37793
110 Radius를 이용한 ssh 인증 서버 구축하기 admin 2013-04-19 36614
109 리눅스 부팅시 자동 실행 명령스크립트 실행하기 만들기 이해 linux booting admin 2017-08-30 35512
108 부팅시 자동실행 명령어 스크립트, rc.local admin 2017-08-30 35378
107 다운된 리눅스서버 응급복구 admin 2013-03-28 32416
106 Build a RADIUS server on Linux admin 2013-03-23 31309
105 FREE RADIUS 활용및 응용 admin 2013-02-23 30624
104 서버이전시 고려할 사항들 admin 2011-12-13 30463
103 리눅스 데비안 네트워크 설정 유선랜 무선랜 linux debian network setting 설정 admin 2017-09-07 30398
102 윈도우XP 알면 정말 편한 숨겨진 기능 60가지 admin 2012-05-11 29862
101 Centos net install web http admin 2012-03-02 29861
100 리눅스 시작시에 부팅시 프로세스 프로그램 자동 실행 설정 admin 2017-08-30 29624
99 네트워크 디바이스명 변경 리눅스 eth0 eth1 admin 2017-08-29 29023
98 Linux 시스템 백업과 복원 admin 2012-02-28 28667
97 파이썬 설치 및 사용하기 admin 2011-12-16 28082
96 한국인/국내기업은 얼마나 Linux Kernel에 기여할까? admin 2012-04-29 27789
95 PUTTY DOWNLOAD - FREE SSH & TELNET CLIENT admin 2017-09-03 27460
94 How To Protect SSH with fail2ban on Debian 7 데비안 ssh 방어 무작위 로그인 admin 2017-09-12 27144
93 Linux 시스템 백업과 복원 admin 2013-04-04 26596
92 the world’s most widely deployed RADIUS server document admin 2017-08-29 26435