std::chrono::gps_clock (3) - Linux Man Pages
Defined in header <chrono>
class gps_clock; (since C++20)
The clock std::chrono::gps_clock is a Clock that represents Global Positioning System (GPS) time. It measures time since 00:00:00, 6 January 1980 UTC.
Leap seconds are not inserted into GPS. Thus, every time a leap second is inserted into UTC, UTC falls another second behind GPS. As of December 2017, UTC is 18 seconds behind GPS, reflecting the 18 leap seconds inserted between 1980 and 2017. Thus, 2018-01-01 00:00:00 UTC is equivalent to 2018-01-01 00:00:18 GPS. GPS is a constant 19 seconds behind TAI.
gps_clock meets the Clock requirements. It does not meet the TrivialClock requirements unless the implementation can guarantee that now() does not throw an exception.
Time point family
Defined in namespace std::chrono
template<class Duration> (since C++20)
using gps_time = std::chrono::time_point<std::chrono::gps_clock, Duration>;
using gps_seconds = gps_time<std::chrono::seconds>; (since C++20)
operator<<_(std::chrono::gps_time) performs stream output on a gps_time
from_stream_(std::chrono::gps_time) parses a gps_time from a stream according to the provided format
to_stream_(std::chrono::gps_time) outputs a gps_time into a stream according to the provided format
Member type Definition
rep signed arithmetic type representing the number of ticks in the clock's duration
period a std::ratio type representing the tick period of the clock, in seconds
duration std::chrono::duration<rep, period>, capable of representing negative durations
constexpr bool is_steady true if the time between ticks is always constant, i.e. calls to now() return values that increase monotonically even in case of some external clock adjustment, otherwise false
now returns a std::chrono::time_point representing the current point in time
to_utc converts a gps_time to utc_time
from_utc converts a utc_time to gps_time