30 Time library [time]

30.11 Time zones [time.zone]

30.11.3 Exception classes [time.zone.exception]

30.11.3.1 Class nonexistent_local_time [time.zone.exception.nonexist]

namespace std::chrono {class nonexistent_local_time : public runtime_error {public:template nonexistent_local_time(const local_time& tp, const local_info& i); };}

nonexistent_local_time is thrown when an attempt is made to convert a non-existent local_time to a sys_time without specifying choose::earliest or choose::latest.

template<class Duration> nonexistent_local_time(const local_time<Duration>& tp, const local_info& i);

Preconditions: i.result == local_info::nonexistent is true.

Effects: Initializes the base class with a sequence of char equivalent to that produced by os.str() initialized as shown below:ostringstream os; os << tp << " is in a gap between\n"<< local_seconds{i.first.end.time_since_epoch()} + i.first.offset << ' '<< i.first.abbrev << " and\n"<< local_seconds{i.second.begin.time_since_epoch()} + i.second.offset << ' '<< i.second.abbrev << " which are both equivalent to\n"<< i.first.end << " UTC";

[Example 1: #include #include int main() {using namespace std::chrono; try {auto zt = zoned_time{"America/New_York", local_days{Sunday[2]/March/2016} + 2h + 30min}; } catch (const nonexistent_local_time& e) { std::cout << e.what() << '\n'; }}

Produces the output:

2016-03-13 02:30:00 is in a gap between
2016-03-13 02:00:00 EST and
2016-03-13 03:00:00 EDT which are both equivalent to
2016-03-13 07:00:00 UTC

â end example]

30.11.3.2 Class ambiguous_local_time [time.zone.exception.ambig]

namespace std::chrono {class ambiguous_local_time : public runtime_error {public:template ambiguous_local_time(const local_time& tp, const local_info& i); };}

ambiguous_local_time is thrown when an attempt is made to convert an ambiguous local_time to a sys_time without specifying choose::earliest or choose::latest.

template<class Duration> ambiguous_local_time(const local_time<Duration>& tp, const local_info& i);

Preconditions: i.result == local_info::ambiguous is true.

Effects: Initializes the base class with a sequence of char equivalent to that produced by os.str() initialized as shown below:ostringstream os; os << tp << " is ambiguous. It could be\n"<< tp << ' ' << i.first.abbrev << " == "<< tp - i.first.offset << " UTC or\n"<< tp << ' ' << i.second.abbrev << " == "<< tp - i.second.offset << " UTC";

[Example 1: #include #include int main() {using namespace std::chrono; try {auto zt = zoned_time{"America/New_York", local_days{Sunday[1]/November/2016} + 1h + 30min}; } catch (const ambiguous_local_time& e) { std::cout << e.what() << '\n'; }}