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// { dg-options "-std=gnu++20" }
// { dg-do run { target c++20 } }
#include <chrono>
#include <testsuite_hooks.h>
void
test01()
{
using namespace std::chrono;
tai_seconds tai_epoch{0s};
utc_seconds tai_as_utc{sys_days{1958y/January/1}.time_since_epoch() - 10s};
VERIFY( clock_cast<utc_clock>(tai_epoch) == tai_as_utc );
VERIFY( tai_epoch == clock_cast<tai_clock>(tai_as_utc) );
sys_days y2k{2000y/January/1};
tai_seconds y2k_as_tai{clock_cast<tai_clock>(y2k)};
utc_seconds y2k_as_utc = utc_clock::from_sys(y2k);
VERIFY( clock_cast<utc_clock>(y2k_as_tai) == y2k_as_utc );
VERIFY( y2k_as_tai == clock_cast<tai_clock>(y2k_as_utc) );
}
void
test02()
{
using namespace std::chrono;
sys_days d{2022y/November/12};
VERIFY( clock_cast<system_clock>(clock_cast<tai_clock>(d)) == d );
tai_seconds t(1234567s);
VERIFY( clock_cast<tai_clock>(clock_cast<system_clock>(t)) == t );
VERIFY( clock_cast<tai_clock>(clock_cast<utc_clock>(t)) == t );
}
void
test03()
{
using namespace std::chrono;
tai_time<tai_clock::duration> tai1 = tai_clock::now();
utc_time<utc_clock::duration> utc = utc_clock::now();
tai_time<tai_clock::duration> tai2 = tai_clock::now();
auto delta = tai2 - tai1;
VERIFY( (utc - clock_cast<utc_clock>(tai1)) <= delta );
VERIFY( (clock_cast<utc_clock>(tai2) - utc) <= delta );
tai_seconds s = time_point_cast<seconds>(tai1);
VERIFY( tai1 - s < 1s );
}
int main()
{
test01();
test02();
test03();
}
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