Hijri to Gregorian in SAP

Dear All,

I used following class & Methos used for Hijri to Gregorian date coversion.

CL_ABAP_DATFM ------> CONV_ISL_TO_GREG_FORMULA

But onday difference is coming.

Eample:

This Method Output is:

Hijri 25.06.1434 ----> Gregorian 06.05.2013

But Correct Output is:

Hijri 25.06.1434 ----> Gregorian 05.05.2013

Is there any standard conversion FM or Program.

(Note: Before Month last date is 29 means current month this one day difference is coming)

Please Giva a solution for y=this issue.