Hi,

the conversion from Upp::String to std::string is explicit by the function member ToStd()

String s_upp;
std::string s_std = s_upp.ToStd();

IMO the easier way is to avoid std::string, Upp::String is simpler, faster.

here a solution for this error:

String Min = Tm.Mid(2,2);
String Tmz = Hr + ":" + Min + ":" + Tm.Mid(4,2);
count<<=Tmz;