how to convert Computer Calender To Hijri Calender in JAVA

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Java

algorithm

actually i was searching for a code or algorithm which i could convert the computer calender to Iranian calender but there are a few problems

for leap year how could I count them by division the number of right year to 4? 2-i can count the date the year but for month & days i can not ,actually I faced to some algorithm but when you try to test them they are not working for days

this is the formula which i already get for the algorithm but it doesn't work for days.

(total of days) -226899 +503/365=answer -1 ==year
(total of days) -226899 +503%365=answer-(the months of Christian calender)
till the answer will be less than 31