A) The date (element 4 in the array) is a unixtime (which is seconds from Jan 1, 1970) UTC timestamp.
B) The third element in the array is the seconds the station has run
C) The second element in the array is the station ID. If you have 16 stations, for example, then it will show 0 to 15 here (n-1). Also, the rain sensor and rain delay output here as 16 (n) and 17 (n+1) respectively.
D) The first number is the program number. There are special numbers which are as follows:
99 and 255: Manual Program
98 and 254: Run-once Program
Otherwise they correspond to the program number minus one (n-1).