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fix conversion from offset_datetime to system_clock::time_point

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This commit is contained in:
ToruNiina 2018-12-12 20:28:11 +09:00
parent 27ad4e2d8f
commit 03be08a2e6
1 changed files with 12 additions and 6 deletions
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18
toml/datetime.hpp
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@ -410,18 +410,24 @@ struct offset_datetime
operator std::chrono::system_clock::time_point() const
{
// get date-time in local timezone
// get date-time
std::chrono::system_clock::time_point tp =
std::chrono::system_clock::time_point(this->date) +
std::chrono::microseconds(this->time);
// get date-time in UTC by subtracting current offset
// get date-time in UTC. let's say we are in +09:00 (JPN).
// writing 12:00:00 in +09:00 means 03:00:00Z. to represent
// 12:00:00Z, first we need to add +09:00.
const auto ofs = get_local_offset();
tp -= std::chrono::hours (ofs.hour);
tp -= std::chrono::minutes(ofs.minute);
tp += std::chrono::hours (ofs.hour);
tp += std::chrono::minutes(ofs.minute);
// add offset defined in this struct
tp += std::chrono::minutes(this->offset);
// here, tp represents 12:00:00 in UTC but we have offset information.
// we need to subtract it. For example, let's say the input is
// 12:00:00-08:00. now we have tp = 12:00:00Z as a result of the above
// conversion. But the actual time we need to return is 20:00:00Z
// because of -08:00.
tp -= std::chrono::minutes(this->offset);
return tp;
}