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<code>date</code><ref>http://man7.org/linux/man-pages/man1/date.1.html</ref> command allows to print or set the system date and time.
<code>date</code><ref>http://man7.org/linux/man-pages/man1/date.1.html</ref> command allows to print or set the system date and [[time]].
 
  
  
== Linux Basic Examples ==
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== Basic Examples ==
 
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<pre>
$date -I or date [[--iso-8601]]
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$date -I or date --iso-8601
2020-01-28
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2020-01-28
  
date '+%Y-%m-%d_%H%M'
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$ date -d now
2023-10-11_1350
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Wed Aug 18 16:47:31 EDT 2019
  
date --[[iso-8601]]=minutes
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$ date -d today
2020-07-07T08:32+04:00
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Wed Aug 18 16:47:32 EDT 2019
  
date --iso-8601=seconds
 
2014-03-19T16:51:16-0600
 
 
$date [[--rfc-3339]]=date
 
2020-01-28
 
 
$ date -d now
 
Wed Aug 18 16:47:31 EDT 2019
 
 
$ date -d [[today]]
 
Wed Aug 18 16:47:32 EDT 2019
 
 
<pre>
 
 
$ date -d yesterday
 
$ date -d yesterday
 
Tue Aug 17 16:47:33 EDT 2019
 
Tue Aug 17 16:47:33 EDT 2019
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$date --rfc-3339=date
 
$date --rfc-3339=date
 
2020-01-28
 
2020-01-28
</pre>
 
  
[[date -r]]
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MacOS:
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$ date +%F_-%T
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2020-08-03_-09:14:54
  
== macOS Examples ==
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</pre>
 
 
date +%F
 
2021-07-18
 
 
 
date +%F-%T
 
2020-08-03-09:14:54
 
 
 
date '+%Y/%m/%d %H:%M:%S'
 
2021/07/18 16:32:26
 
 
 
[[date +%s]]
 
1655753367
 
 
 
== [[Cisco IOS]] ==
 
* <code>[[show clock]]</code>
 
  
 
== Activities ==
 
== Activities ==
 
# Read <code>date</code> man page: http://man7.org/linux/man-pages/man1/date.1.html
 
# Read <code>date</code> man page: http://man7.org/linux/man-pages/man1/date.1.html
# [[Prepend]] <code>date</code> output at the beginning of each line: <code>cat your_file.txt | [[while read]] i; do echo "$(date) $i"; done</code>
 
  
== Related ==
 
* <code>[[datetime]]</code> https://docs.python.org/3/library/datetime.html
 
* <code>[[ts]]</code> (<code>[[apt install moreutils]]</code>)
 
  
 
== See also ==
 
== See also ==
* {{date}}
 
 
* {{logging}}
 
* {{logging}}
 
* [[Cisco IOS]]: <code>[[show clock]]</code>
 
* [[Cisco IOS]]: <code>[[show clock]]</code>

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