Update cheatsheets

date

@@ -0,0 +1,41 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# date
+
+> Set or display the system date.
+> More information: <https://www.gnu.org/software/coreutils/date>.
+
+- Display the current date using the default locale's format:
+
+`date +%c`
+
+- Display the current date in UTC, using the ISO 8601 format:
+
+`date -u +%Y-%m-%dT%H:%M:%S%Z`
+
+- Display the current date as a Unix timestamp (seconds since the Unix epoch):
+
+`date +%s`
+
+- Convert a date specified as a Unix timestamp to the default format:
+
+`date -d @{{1473305798}}`
+
+- Convert a given date to the Unix timestamp format:
+
+`date -d "{{2018-09-01 00:00}}" +%s --utc`
+
+- Display the current date using the RFC-3339 format (`YYYY-MM-DD hh:mm:ss TZ`):
+
+`date --rfc-3339=s`
+
+- Set the current date using the format `MMDDhhmmYYYY.ss` (`YYYY` and `.ss` are optional):
+
+`date {{093023592021.59}}`
+
+- Display the current ISO week number:
+
+`date +%V`