SHELL

runtime=$(date +\%Y\%m\%d\%H\%M\%S)

# -d date arithmetic
# Display the time described by the user friendly string, not by now.
date -d "+5 days"
date -d "+7 weeks +2 days"
date -d "last Wednesday 2 pm"

runtime=$(date +\%Y\%m\%d\%H\%M\%S)

# Time Zones
# Some z and z specifiers show the current active time zone
echo $(date '+%z'   ) # +0200
echo $(date '+%:z'  ) # +02:00
echo $(date '+%::z' ) # +02:00:00
echo $(date '+%:::z') # +02         (Print required precision only)
echo $(date '+%Z'   ) # CEST        (Alphabetic timezone abbreviation)