Split one or more dates of the form yyyymmddHHMM into date: yyyymmdd and time: HHMM.
[datum, time] = splitlongdate(longdate)
longdate: Vector of integers of format YYYYMMDDHHMM.
datum: Vector of integers of format yyyymmdd. time: Vector of integers of format HHMM.
[datum, time] = splitlongdate(200808141200)
datum = 20080814 time = 1200