data types for "times"? increment for "times"? .... size of data types on the
given compiler? ...

best to look at the assembler code generated by the C compiler for your TH conversion statements. whatever else is going on, as long as this does not work you should be looking at the generated assembler code. probably the C code is the problem, but what if is the compiler (doubtful). anyway, more insight is in the assembler output.

james