I simple want to parse a time-string to a chrono::system_clock::time_point using:
#include <iosfwd> #include "date/date.h" std::stringstream ssTime; ssTime << "17:34:05"; std::chrono::system_clock::time_point tp_time; ssTime >> date::parse("%H:%M:%S", tp_time); I expected to get the time_point of the specified time after EPOCH, but instead I get 0 (i.e. EPOCH).
Note, that I'm using the date library of Howard Hinnant .
The design of the parse function is that if you don't parse enough information for the type being parsed, the failbit is set on the stream. parse considers the {h, m, s} information insufficient for uniquely determining an instant in time (a system_clock::time_point), so this parse fails.
You can make this work by parsing into a seconds duration instead:
#include "date/date.h" #include <sstream> int main() { std::stringstream ssTime; ssTime << "17:34:05"; std::chrono::seconds tp_time; ssTime >> date::parse("%H:%M:%S", tp_time); } tp_time will have the value of 63245s in this example.
