30 Time library [time]

30.7 Clocks [time.clock]

30.7.5 Class gps_clock [time.clock.gps]

30.7.5.2 Member functions [time.clock.gps.members]

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static time_point now();
1
#
Returns: from_utc(utc_clock​::​now(), or a more accurate value of gps_time.
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template<class Duration> static utc_time<common_type_t<Duration, seconds>> to_utc(const gps_time<Duration>& t) noexcept;
2
#
Returns: utc_time<common_type_t<Duration, seconds>>{t.time_since_epoch()} + 315964809s
[Note 1: 315964809s == sys_days{1980y/January/Sunday[1]} - sys_days{1970y/January/1} + 9s — end note]
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template<class Duration> static gps_time<common_type_t<Duration, seconds>> from_utc(const utc_time<Duration>& t) noexcept;
3
#
Returns: gps_time<common_type_t<Duration, seconds>>{t.time_since_epoch()} - 315964809s
[Note 2: 315964809s == sys_days{1980y/January/Sunday[1]} - sys_days{1970y/January/1} + 9s — end note]

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