this command is used to dispaly date and time of the system
$date
display the weekday for that date
$ date -d "1992-04-23"
dispalys the week and the year
$ date +"week:%V year:%y"
displays the date in the next year
$ date -d next-year
displays the date in the next year
$ date -d next-year
calculate epoch time
$ date +%s
gives poin of time at the partucular date
$ date -d "1997-04-23" +"%s"
you can get the tiime zone
$ TZ=PDT date
set the time to given date
$ date --set "20190101 11:00"
gives week and weekday and month and year
$ date +"week:%V weekday:%A month:%B year:%y"
gives the specific weekday for the date
$date -d "2023-08-23" +"%A"
gives the error invalid date
$ date -d "15-01-2023"
prints the whole year caleder of 2012
cal 2012
prints the august 2019 calender
cal 08 2019
prints 2025 calender
cal 2025