ILE - Date Substraction

Hello All,
                     We have a set of  statments in RPG/400, which
basically takes the last report date and  calculate  exaclty  one month
before. Its now kind of  more messed up with all Y2K changes. Though it
works fine, since I converted  those to
RPGLE, I  was   just wondering , if I can use  ILE and  make it simple with
few statements


For example    if              Last Report  date        Result date
                                     1.            5.31.98
4.30.98
                                     2.            3.31.98
2.28.98
                                     3.             7.15.98
6.15.98

Now, is there anyway , we can use  in  ILE, like  SUBDUR to   find   out
exactly  one month before from a given date.

Like     If the given date   is 5.31.98    which should give  4.30.98


Any help is greatly appreciated

Thanks

Regards
Raj


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