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date: Use ArgsParser and add ISO8601 / RFC3339 / RFC5322 output formats

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Brendan Coles 2021-01-07 16:47:16 +00:00 committed by Andreas Kling
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2 changed files with 77 additions and 9 deletions

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## Name
date - print or set the system date and time
## Synopsis
```**sh
$ date [--set date] [--unix] [--iso-8601] [--rfc-3339] [--rfc-5322]
```
## Description
date is a utility to set the system date and time
or print the system date and time in various formats.
## Options
* `-s`, `--set`: Set system date and time
* `-u`, `--unix`: Print date as Unix timestamp
* `-i`, `--iso-8601`: Print date in ISO 8601 format
* `-r`, `--rfc-3339`: Print date in RFC 3339 format
* `-R`, `--rfc-5322`: Print date in RFC 5322 format
## Examples
```sh
# Print the current date and time in ISO 8601 format
$ date --iso-8601
# Set date to 1610017485 (UNIX time)
$ date -s 1610017485
```