std::chrono::sys_info

Defined in header <chrono>
struct sys_info;		(since C++20)

The class sys_info describes time zone information associated with a time zone at a particular point in time (represented as either a std::chrono::sys_time or a std::chrono::local_time

Member objects

Member object	Type
begin, end	std::chrono::sys_seconds
offset	std::chrono::seconds
save	std::chrono::minutes
abbrev	std::string

The begin and end data members indicate the range - [begin, end) - in which the offset and abbrev are in effect for the time zone associated with this sys_info

The offset and abbrev data member indicate the UTC offset and time zone abbreviation, respectively, in effect for the associated time zone and std::chrono::time_point

The save data member, if nonzero, indicates that the time zone is on daylight saving time at the specified time point. In this case, offset - save is a suggestion of what offset this time zone might use if it were off daylight saving time. However, this information is not authoritative: the only way to ascertain the actual offset is to query the time zone with a time point that is actually off daylight savings time (i.e. returns a sys_info such that save == 0min

Nonmember functions

operator<< (C++20)

outputs a sys_info into a stream (function template)

Helper classes

std::formatter<std::chrono::sys_info> (C++20)

formatting support for sys_info (class template specialization)

Example

This section is incomplete Reason: no example