Android Question any one know about lunar calendar?

Here http://www.b4x.com/android/forum/threads/astro-library.15975/

Or here http://www.b4x.com/android/forum/threads/dateconvert-library.16770/
both libraries use the same algorithm, for the Hebrew calander.
The Hebrew calander is lunar and compensates for the difference from the sun calander, unlike other lunar calanders which don't, so you have to check if it provides the right result for what you need.