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Test ambiguous time

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This commit is contained in:
Victor Zverovich
2025-03-23 10:34:37 -07:00
parent 989826ce50
commit 43e31614cc
3 changed files with 24 additions and 9 deletions
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include/fmt/chrono.h
+10 -5
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@@ -2320,15 +2320,20 @@ struct formatter<local_time<Duration>, Char> : formatter<std::tm, Char> {
template <typename FormatContext>
auto format(local_time<Duration> val, FormatContext& ctx) const
-> decltype(ctx.out()) {
auto time_since_epoch = val.time_since_epoch();
auto seconds_since_epoch =
detail::duration_cast<std::chrono::seconds>(time_since_epoch);
// Use gmtime to prevent time conversion since local_time has an
// unspecified time zone.
auto t = gmtime(seconds_since_epoch.count());
using period = typename Duration::period;
if (period::num == 1 && period::den == 1 &&
!std::is_floating_point<typename Duration::rep>::value) {
return formatter<std::tm, Char>::format(localtime(val), ctx);
return formatter<std::tm, Char>::format(t, ctx);
}
auto epoch = val.time_since_epoch();
auto subsecs = detail::duration_cast<Duration>(
epoch - detail::duration_cast<std::chrono::seconds>(epoch));
return formatter<std::tm, Char>::do_format(localtime(val), ctx, &subsecs);
auto subsecs =
detail::duration_cast<Duration>(time_since_epoch - seconds_since_epoch);
return formatter<std::tm, Char>::do_format(t, ctx, &subsecs);
}
};