The local time problem in Stellarium is known and is in the to do list. It could be fixed in the next release.
I don't know how to program in C,or C++ but I wrote a program in quick basic many years ago to do such a conversion and compiled it so it runs in Windows XP as a command line program. The maths is pretty straight forward and all the algorithms and formulae came from Peter Duffet Smith's book.
Barry
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