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Fix parse of sys_time with supplied offset, but no offset parse

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* If parsing sys_time, and an offset is supplied to be parsed into,
  but is not parsed into, neither read that parsed offset, nor write
  to it.  The parsed local time offset is assumed to be 0min if no
  offset is parsed.
This commit is contained in:
Howard Hinnant
2025-07-04 23:52:00 -04:00
parent 229c6876c6
commit e32a0d809c
1 changed files with 14 additions and 4 deletions
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18
include/date/date.h
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@@ -8036,15 +8036,25 @@ from_stream(std::basic_istream<CharT, Traits>& is, const CharT* fmt,
{
using CT = typename std::common_type<Duration, std::chrono::seconds>::type;
using detail::round_i;
std::chrono::minutes offset_local{};
auto offptr = offset ? offset : &offset_local;
std::chrono::minutes offset_local = std::chrono::minutes::min();
fields<CT> fds{};
fds.has_tod = true;
date::from_stream(is, fmt, fds, abbrev, offptr);
date::from_stream(is, fmt, fds, abbrev, &offset_local);
if (!fds.ymd.ok() || !fds.tod.in_conventional_range())
is.setstate(std::ios::failbit);
if (!is.fail())
tp = round_i<Duration>(sys_days(fds.ymd) - *offptr + fds.tod.to_duration());
{
if (offset_local != std::chrono::minutes::min())
{
tp = round_i<Duration>(sys_days(fds.ymd) - offset_local + fds.tod.to_duration());
if (offset != nullptr)
*offset = offset_local;
}
else
{
tp = round_i<Duration>(sys_days(fds.ymd) + fds.tod.to_duration());
}
}
return is;
}