Date - Revision history

Leo: /* Show the next 3 months of the calendar */ don't do it the stupid way

2021-12-06T01:31:49Z

Show the next 3 months of the calendar: don't do it the stupid way

← Older revision		Revision as of 01:31, 6 December 2021
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	=== Show the next 3 months of the calendar ===		=== Show the next 3 months of the calendar ===
	{{Highlight		{{Highlight
	\| code = $ ~~for m in 0 1 2; do~~ cal ~~$(date~~ -~~d "+$m month" "+%m %Y"); done~~		\| code = $ cal -n 3
	July 2021		July 2021
	Su Mo Tu We Th Fr Sa		Su Mo Tu We Th Fr Sa

Leo: Leo moved page The date Command to Date

2021-07-03T05:21:52Z

Leo moved page The date Command to Date

← Older revision		Revision as of 05:21, 3 July 2021
(No difference)

Leo at 04:50, 3 July 2021

2021-07-03T04:50:07Z

← Older revision		Revision as of 04:50, 3 July 2021
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	The {{code\|date}} unix utility can set or show the current time.		The {{code\|date}} unix utility can set or show the current time.

	==~~Cheat Sheet~~==		==Date output cheat sheet==
	The date utility can be ~~used with~~ a custom format ~~specified by as {{~~code\|+<~~FORMAT~~>}}.		The date utility outputs the date and time using the ISO 8601 format by default (which looks something like <code>Fri Jul 2 22:27:43 MDT 2021</code>). This can be overridden by passing in a custom format string that always begins with a <code>+</code> symbol. Below are some examples of some commonly used formats:

	~~Here~~ are some commonly used formats.
	{\| class="wikitable"		{\| class="wikitable"
	!Format		!Format
Line 10:		Line 8:
	!Comment		!Comment
	\|-		\|-
	\|date		\|<code>date</code>
	\|Thu Jun 11 14:00:47 MDT 2020		\|Thu Jun 11 14:00:47 MDT 2020
	\|~~default~~ output		\|Default ISO8601 output
	\|-		\|-
	\|date +%T		\|<code>date +%T</code>
	date +"%H:%M:%S"		<code>date +"%H:%M:%S"</code>
	\|12:34:56		\|12:34:56
	\|HH:MM:SS		\|HH:MM:SS
	Both short and long way		Both short and long way
	\|-		\|-
	\|date +%r		\|<code>date +%r</code>
	\|09:30:55 PM		\|09:30:55 PM
	\|HH:MM:SS AA		\|The time as HH:MM:SS AA
	\|-		\|-
	\|date +%m-%d-%y		\|<code>date +%m-%d-%y</code>
	\|12-02-15		\|12-02-15
	\|MM:DD:YY		\|MM:DD:YY
	\|-		\|-
	\|date +%m-%d-%Y		\|<code>date +%m-%d-%Y</code>
	\|12-02-2015		\|12-02-2015
	\|MM:DD:YYYY		\|MM:DD:YYYY
	\|-		\|-
	\|date +%D		\|<code>date +%D</code>
	\|12/02/2015		\|12/02/2015
	\|MM/DD/YYYY		\|MM/DD/YYYY
			\|-
			\|<code>date +"%B %d, %Y"</code>
			\|December 2, 2015
			\|Month DD, YYYY
	\|}		\|}

	<br />		See the date man page for the other date and time field options.

			==Parsing a string timestamp with date==
			Date can parse a timestamp by passing it into date with the <code>--date</code> or <code>-d</code> argument. The specific acceptable format is not well defined by the man page but the command is generally quite forgiving. The given date can contain the time of day, calendar date, timezone, as well as time modifiers.

			The time modifier must be at the end of the given date argument and be of this format: <code>MODIFIER_NUMBER UNIT [ago]</code>. Where unit can be seconds, minutes, hours, days, weeks, months, years. 'ago' reverses the direction of the modifier.

	~~== Parsing a String Timestamp ==~~		Some examples:{{highlight\|lang=terminal\|code=
	~~Date can parse a timestamp by passing it into date with the {{code\|--date}} argument and then formatting the output.~~{{highlight\|lang=terminal\|code=
	$ date --date="Dec 25, 1889" +%m-%d-%y		$ date --date="Dec 25, 1889" +%m-%d-%y
	12-25-89		12-25-89
	}}

	== Unix ~~Timestamp~~ ==		$ date --date="12:33 AM 12/25/89 1 day"
			Tue Dec 26 12:33:00 MST 1989

			$ date --date="12:33 AM 12/25/89 1 year ago"
			Sun Dec 25 00:33:00 MST 1988
			}}<br />
			==Working with Unix timestamps==

	=== Convert ~~Timestamp~~ to Unix ~~Time~~ ===		===Convert a date to Unix time===
	{{highlight\|lang=terminal\|code=		{{highlight\|lang=terminal\|code=
	## Convert to unix timestamp		## Convert to unix timestamp
Line 58:		Line 69:
	}}		}}

	=== Convert Unix ~~Time~~ to ~~Formatted Timestamp~~ ===		===Convert a Unix timestamp to a formatted date string===
	{{highlight\|lang=terminal\|code=		Pass your unix timestamp to date using the <code>-d @#####</code> parameter, then use one of the date format strings listed above to format the output.{{highlight\|lang=terminal\|code=
	## Convert from unix timestamp		## Convert from unix timestamp
	$ date -d @1603735163 +"%Y %m %d %H:%M:%S"		$ date -d @1603735163 +"%Y %m %d %H:%M:%S"
	2020 10 26 11:59:23		2020 10 26 11:59:23
	}}		}}
	==Setting the System Clock==		==Other tasks==
			===Setting the System Clock===
	Although you really should be using NTP instead, on systems that have no network access, you can set the system clock by running:		Although you really should be using NTP instead, on systems that have no network access, you can set the system clock by running:
	{{highlight\|lang=terminal\|code=		{{highlight\|lang=terminal\|code=
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	}}		}}

			=== Show time in UTC ===
			Date uses the system's timezone as specified by <code>/etc/localtime</code>. To force date to use UTC time, one option is to override the TZ environment variable:
			{{Highlight
			\| code = $ TZ=UTC0 date
			Sat Jul 3 04:49:26 UTC 2021

			$ date
			Fri Jul 2 22:49:09 MDT 2021
			\| lang = terminal
			}}

			=== Show the next 3 months of the calendar ===
			{{Highlight
			\| code = $ for m in 0 1 2; do cal $(date -d "+$m month" "+%m %Y"); done
			July 2021
			Su Mo Tu We Th Fr Sa
			1 2 3
			4 5 6 7 8 9 10
			11 12 13 14 15 16 17
			18 19 20 21 22 23 24
			25 26 27 28 29 30 31

			August 2021
			Su Mo Tu We Th Fr Sa
			1 2 3 4 5 6 7
			8 9 10 11 12 13 14
			15 16 17 18 19 20 21
			22 23 24 25 26 27 28
			29 30 31

	{{Navbox Linux}}		September 2021
			Su Mo Tu We Th Fr Sa
			1 2 3 4
			5 6 7 8 9 10 11
			12 13 14 15 16 17 18
			19 20 21 22 23 24 25
			26 27 28 29 30
			\| lang = terminal
			}}{{Navbox Linux}}
	[[Category:Linux]]		[[Category:Linux]]

	[[Category:LinuxUtilities]]		[[Category:LinuxUtilities]]

Leo at 18:04, 26 October 2020

2020-10-26T18:04:27Z

← Older revision		Revision as of 18:04, 26 October 2020
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	The {{code\|date}} unix utility can set or show the current time.		The {{code\|date}} unix utility can set or show the current time.

	== Cheat Sheet ==		==Cheat Sheet==
	The date utility can be used with a custom format specified by as {{code\|+<FORMAT>}}.		The date utility can be used with a custom format specified by as {{code\|+<FORMAT>}}.

	Here are some commonly used formats.		Here are some commonly used formats.
	{\| class="wikitable"		{\| class="wikitable"
	! Format		!Format
	! Output		!Output
	! Comment		!Comment
	\|-		\|-
	\| date		\|date
	\| Thu Jun 11 14:00:47 MDT 2020		\|Thu Jun 11 14:00:47 MDT 2020
	\| default output		\|default output
	\|-		\|-
	\| date +%T		\|date +%T
	\| 12:34:56		date +"%H:%M:%S"
	\| HH:MM:SS		\|12:34:56
			\|HH:MM:SS
			Both short and long way
	\|-		\|-
	\| date +%r		\|date +%r
	\| 09:30:55 PM		\|09:30:55 PM
	\| HH:MM:SS AA		\|HH:MM:SS AA
	\|-		\|-
	\| date +%m-%d-%y		\|date +%m-%d-%y
	\| 12-02-15		\|12-02-15
	\| MM:DD:YY		\|MM:DD:YY
	\|-		\|-
	\| date +%m-%d-%Y		\|date +%m-%d-%Y
	\| 12-02-2015		\|12-02-2015
	\| MM:DD:YYYY		\|MM:DD:YYYY
	\|-		\|-
	\| date +%D		\|date +%D
	\| 12/02/2015		\|12/02/2015
	\| MM/DD/YYYY		\|MM/DD/YYYY
	\|}		\|}

	Date can ~~also~~ parse a timestamp ~~given~~ with {{code\|--date}} argument.		<br />
	{{highlight\|lang=terminal\|code=
			== Parsing a String Timestamp ==
			Date can parse a timestamp by passing it into date with the {{code\|--date}} argument and then formatting the output.{{highlight\|lang=terminal\|code=
	$ date --date="Dec 25, 1889" +%m-%d-%y		$ date --date="Dec 25, 1889" +%m-%d-%y
	12-25-89		12-25-89
			}}

			== Unix Timestamp ==

			=== Convert Timestamp to Unix Time ===
			{{highlight\|lang=terminal\|code=
	## Convert to unix timestamp		## Convert to unix timestamp
	$ date --date="Dec 25, 1889" +%s		$ date --date="Dec 25, 1889" +%s
	-2525099168		-2525099168

	## Or to nanoseconds (9 ~~0's)~~		## Or to nanoseconds by appending 9 zeros
	$ date --date="Dec 25, 1998" +%s000000000		$ date --date="Dec 25, 1998" +%s000000000
	914569200000000000		914569200000000000
	}}		}}

			=== Convert Unix Time to Formatted Timestamp ===
	== Setting the ~~Time~~ ==		{{highlight\|lang=terminal\|code=
	~~You~~ can set the system clock:		## Convert from unix timestamp
			$ date -d @1603735163 +"%Y %m %d %H:%M:%S"
			2020 10 26 11:59:23
			}}
			==Setting the System Clock==
			Although you really should be using NTP instead, on systems that have no network access, you can set the system clock by running:
	{{highlight\|lang=terminal\|code=		{{highlight\|lang=terminal\|code=
	# date -s "Mar 30 2020 13:16"		# date -s "Mar 30 2020 13:16"
	}}		}}

	~~Though, you really should be using NTP instead.~~


	{{Navbox Linux}}[[Category:Linux]]		{{Navbox Linux}}
			[[Category:Linux]]

	[[Category:LinuxUtilities]]		[[Category:LinuxUtilities]]

Leo at 20:09, 11 June 2020

2020-06-11T20:09:49Z

← Older revision		Revision as of 20:09, 11 June 2020
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	The {{code\|date}} unix utility can set or show the current time.		The {{code\|date}} unix utility can set or show the current time.

	== ~~Setting the Time~~ ==		== Cheat Sheet ==
	~~You~~ can ~~set the system clock:~~		The date utility can be used with a custom format specified by as {{code\|+<FORMAT>}}.
	{{~~highlight\|lang=terminal~~\|~~code=~~
	~~# date -s "Mar 30 2020 13:16"~~
	}}

	~~Though, you really should be using NTP instead.~~		Here are some commonly used formats.

	~~== Formatting ==~~
	~~{{code\|date}} can be formatted using the {{code\|+}} argument followed by the format string. For example:~~
	~~{{highlight\|lang=terminal\|code=~~
	~~# date +"%T"~~
	~~11:26:25~~
	}}

	Here are some ~~common~~ formats.
	{\| class="wikitable"		{\| class="wikitable"
	! Format		! Format
	! Output		! Output
			! Comment
			\|-
			\| date
			\| Thu Jun 11 14:00:47 MDT 2020
			\| default output
	\|-		\|-
	\| %T		\| date +%T
	\| 12:34:56 ~~(ie:~~ HH:MM:SS)		\| 12:34:56
			\| HH:MM:SS
	\|-		\|-
	\| %r		\| date +%r
	\| 09:30:55 PM ~~(ie:~~ HH:MM:SS ~~XX)~~		\| 09:30:55 PM
			\| HH:MM:SS AA
	\|-		\|-
	\| %m-%d-%y		\| date +%m-%d-%y
	\| 12-02-15 ~~(ie:~~ MM:DD:YY)		\| 12-02-15
			\| MM:DD:YY
	\|-		\|-
	\| %m-%d-%Y		\| date +%m-%d-%Y
	\| 12-02-2015 ~~(ie:~~ MM:DD:YYYY)		\| 12-02-2015
			\| MM:DD:YYYY
	\|-		\|-
	\| %D		\| date +%D
	\| 12/02/2015 ~~(ie:~~ MM/DD/YYYY)		\| 12/02/2015
			\| MM/DD/YYYY
	\|}		\|}

			Date can also parse a timestamp given with {{code\|--date}} argument.
			{{highlight\|lang=terminal\|code=
			$ date --date="Dec 25, 1889" +%m-%d-%y
			12-25-89

			## Convert to unix timestamp
			$ date --date="Dec 25, 1889" +%s
			-2525099168

			## Or to nanoseconds (9 0's)
			$ date --date="Dec 25, 1998" +%s000000000
			914569200000000000
			}}


			== Setting the Time ==
			You can set the system clock:
			{{highlight\|lang=terminal\|code=
			# date -s "Mar 30 2020 13:16"
			}}

			Though, you really should be using NTP instead.

Leo at 20:21, 30 March 2020

2020-03-30T20:21:03Z

← Older revision		Revision as of 20:21, 30 March 2020
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	The {{code\|date}} unix utility ~~returns~~ the time ~~as a text string~~.		The {{code\|date}} unix utility can set or show the current time.

			== Setting the Time ==
			You can set the system clock:
			{{highlight\|lang=terminal\|code=
			# date -s "Mar 30 2020 13:16"
			}}

			Though, you really should be using NTP instead.

	== Formatting ==		== Formatting ==

Leo: Text replacement - "Category:Linux{{Navbox Linux}}" to "{{Navbox Linux}}Category:Linux"

2019-09-01T06:20:49Z

Text replacement - "Category:Linux{{Navbox Linux}}" to "{{Navbox Linux}}Category:Linux"

← Older revision		Revision as of 06:20, 1 September 2019
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	[[Category:Linux]]~~{{Navbox Linux}}~~		{{Navbox Linux}}[[Category:Linux]]

	[[Category:LinuxUtilities]]		[[Category:LinuxUtilities]]

Leo: Text replacement - "{{Navbox Linux}}{{Navbox Linux}}" to "{{Navbox Linux}}"

2019-09-01T05:10:37Z

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	[[Category:Linux]]~~{{Navbox Linux}}~~{{Navbox Linux}}		[[Category:Linux]]{{Navbox Linux}}

	[[Category:LinuxUtilities]]		[[Category:LinuxUtilities]]

Leo: Text replacement - "Category:Linux" to "Category:Linux{{Navbox Linux}}"

2019-09-01T05:09:14Z

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2019-09-01T05:01:37Z

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	[[Category:Linux]]		[[Category:Linux]]{{Navbox Linux}}

	[[Category:LinuxUtilities]]		[[Category:LinuxUtilities]]