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31b3db David Marsh 2026-04-23 05:19:29
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# Date
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252423 David Marsh 2026-04-23 05:27:14
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*doing fun stuff with the linux date command*
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## Show the week number
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f6b29c David Marsh 2026-04-23 05:27:31
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```bash
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date +%U
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```
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## ISO8601 format
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```bash
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date --iso
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```
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346395 David Marsh 2026-04-23 05:44:43
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or using [homebrew](https://brew.sh):
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```bash
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gdate --iso
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```
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252423 David Marsh 2026-04-23 05:27:14
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MacOS date command doesn't support `iso`, here are some useful variations:
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```bash
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date "+%Y-%m-%d"
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```
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```bash
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date "+%Y%m%dT%H%M%S"
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```
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## Yesterday and Tomorrow
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```bash
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$ date +%A --date today-1days
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Wednesday
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$ date +%A --date today+1days
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Friday
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$ date +%A --date yesterday
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Wednesday
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$ date +%A --date "2 days ago"
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Tuesday
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```
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This also works as expected for other variables:
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```bash
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$ date +%Y --date "last year"
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2011
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$ date --date "next monday"
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Mon Mar 19 00:00:00 EST 2012
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```
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Here's the entry from the `man` page:
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```
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DATE STRING
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The --date=STRING is a mostly free format human readable date string
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such as "Sun, 29 Feb 2004 16:21:42 -0800" or "2004-02-29 16:21:42"
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or even "next Thursday". A date string may contain items indicating
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calendar date, time of day, time zone, day of week, relative time,
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relative date, and numbers. An empty string indicates the beginning
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of the day. The date string format is more complex than is easily
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documented here but is fully described in the info documentation.
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```
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*damn* you info docs!