Here you go:
# date -r 123439819723 '+%m/%d/%Y:%H:%M:%S'
08/26/5881:17:48:43
In a bash script you could have something like this:
if [[ "$OSTYPE" == "linux-gnu"* ]]; then
dayOfWeek=$(date --date @1599032939 +"%A")
dateString=$(date --date @1599032939 +"%m/%d/%Y:%H:%M:%S")
elif [[ "$OSTYPE" == "darwin"* ]]; then
dayOfWeek=$(date -r 1599032939 +%A)
dateString=$(date -r 1599032939 +%m/%d/%Y:%H:%M:%S)
fi