std::pair<bool, std::time_t> parseMonthInterval( std::time_t t, const std::string& date );
std::pair<bool, std::time_t> parseYearInterval( std::time_t t, const std::string& date );
std::pair<bool, std::time_t> parseMonthInterval( std::time_t t, const std::string& date );
std::pair<bool, std::time_t> parseYearInterval( std::time_t t, const std::string& date );