Reserves packed prior to Nov. 29, 2019* require a repack (FAR 105.43).
(* please refresh, if you did not open the page just now)
(Original date plus 180 days)
simply takes the date of your last reserve (re-)pack, adds 180 days to it and gives you the due date for your next reserve repack.
Important: Please enter the date using numbers and forward slash only, observing the format provided underneath the input box: Month/Day of Month/Year.