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Date

Set or show the date
See also Time shifting issues and how to set the hardware clock
strftime(3) - Linux manual page

Command	Function
date +%d	Display the current day number e.g 21
date --date="100 days"	Shows the date 100 days in the future
date --date='@2147483647'	Calculate date from epoch
echo $(date +\%Y\%m\%d\%H\%M)	Show the formatted date
date '+%s' -d '2011-11-04'	Calculate the seconds between 1 January 1970 and 4 November 2011, epoch
date '+%s' --date="now"	Calcualte the date of now in epoch
date '+%s%N'	Calcualte the date of now in epoch in nanoseconds
printf '%(%d-%m-%Y %H:%M)T\n'	20-06-2021 16:25 (date and time of now). Check strftime(3) for possible options. Not all options of the date command are available for printf (like %N)
bc <<< `date '+%s' -d '2016-09-06'`-`date '+%s' -d '2016-07-01'`	Calculate the seconds between the two dates. Result: 5788800 The number of weeks is: bc «< 5788800/3600/24/7 is 9 weeks
echo $(( (`date '+%s' -d '2018-9-4'`-`date '+%s' -d '2018-07-21'`)/3600/24 ))	45 days

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