date
Options
--date=<STRING>,-d <STRING>- 
date-help-date
 --file=<DATEFILE>,-f <DATEFILE>- 
date-help-file
 --iso-8601=<FMT>,-I <FMT>- 
date-help-iso-8601
 --rfc-email,-R- 
date-help-rfc-email
 --rfc-3339=<FMT>- 
date-help-rfc-3339
 --debug- 
date-help-debug
 --reference=<FILE>,-r <FILE>- 
date-help-reference
 --set=<STRING>,-s <STRING>- 
date-help-set
 --universal,-u- 
date-help-universal
 
Examples
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|--utc]}} +%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|--date]}} @{{1473305798}}
Convert a given date to the Unix timestamp format:
date {{[-d|--date]}} "{{2018-09-01 00:00}}" +%s {{[-u|--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
The examples are provided by the tldr-pages project under the CC BY 4.0 License.
Please note that, as uutils is a work in progress, some examples might fail.