It's also worth noting that 'winter' used to be monthless in the Roman calendar, so there were 10 months, ending in December (so all of the number names make sense) and then a big blob of 'winter' before the new year started.
MyClass::MyClass(const std::string& s) : m_s(s) {}
std::string s = "Some string";
MyClass c(s);
MyClass::MyClass(std::string s) : m_s(std::move(s)) {}