this dll contain one class called dateconv with only one method 
the method is transdate,this method has two arguments the first is the date you want to convert ,the second argument is an integer value either 
1------>if you want to convert from georgian to hijrii
2------>if you want to convert from hijrii to geogian

example:

myvariable.transdate(mydate,1)---->to convert to hijrii date
myvariable.transdate(mydate,2)---->to convert to georgian date