need help for logic to find no.of months betwen starting date and ending date

Hi

i
have requirment   i need to extrct the data between two dates'
STARTING DATE and Ending DATE in the like between months and between year

eg:

starting

date DT_DA = 20131003 (yyyymmdd) => use 10 month

ending

date DT_A = 20140401 (yyyymmdd) => use 04 month



so, the program should consider the

months 10-11-12-01-02-03-04

 
- in ZESE we need to access

with the year range (YYYYmmdd)

contained in the DT_DA and DT_A

es:

starting

date DT_DA = 20131003 (yyyymmdd) => use 2013 year

ending

date DT_A = 20140401 (yyyymmdd) => use 2014 year

so, the program should consider the

years 2013-2014

so  plse find below the select shouldbe structured in this way:

SELECT  * FROM  zrmm_076

WHERE  zcodleg =   2_v_zcodleg

AND zper =

(month range of DT_DA/DT_A)

AND zese =  (year

range of DT_DA/DT_A)

AND  causmov IN
s_caus                          


AND datvis_ent BETWEEN starting
data           

AND ending date

AND zmovdoppi = space.