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2026-04-23 05:27:14 David Marsh: -/-
howto/date.md ..
@@ 1,5 1,66 @@
# Date
+ *doing fun stuff with the linux date command*
+
## Show the week number
- date +%U
+ `date +%U`
+
+ ## ISO8601 format
+
+ ```bash
+ $ date --iso
+ 2021-09-27
+ ```
+
+ MacOS date command doesn't support `iso`, here are some useful variations:
+
+ ```bash
+ $ date "+%Y-%m-%d"
+ 2021-09-27
+
+ $ date "+%Y%m%dT%H%M%S"
+ 20210927T093333
+ ```
+
+ ## Yesterday and Tomorrow
+
+ ```bash
+ $ date +%A --date today-1days
+ Wednesday
+
+ $ date +%A --date today+1days
+ Friday
+
+ $ date +%A --date yesterday
+ Wednesday
+
+ $ date +%A --date "2 days ago"
+ Tuesday
+ ```
+
+ This also works as expected for other variables:
+
+ ```bash
+ $ date +%Y --date "last year"
+ 2011
+
+ $ date --date "next monday"
+ Mon Mar 19 00:00:00 EST 2012
+ ```
+
+ Here's the entry from the `man` page:
+
+ ```
+ DATE STRING
+
+ The --date=STRING is a mostly free format human readable date string
+ such as "Sun, 29 Feb 2004 16:21:42 -0800" or "2004-02-29 16:21:42"
+ or even "next Thursday". A date string may contain items indicating
+ calendar date, time of day, time zone, day of week, relative time,
+ relative date, and numbers. An empty string indicates the beginning
+ of the day. The date string format is more complex than is easily
+ documented here but is fully described in the info documentation.
+ ```
+
+ *damn* you info docs!
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