https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63400
--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #10) > GetSystemTimePreciseAsFileTime gives UTC, so would need adjustment for leap > seconds to turn it into a sys_time. That's doable though. Doable, but it would make calls to system_clock::now() slower, because converting UTC to system requires a lookup in the leap second table, and then adjusting the time. Another option would be to leave system_clock alone, but make utc_clock fast and precise on Windows, and make high_resolution_clock a separate type (not a typedef for system_clock) which happens to use the same implementation as utc_clock. > Also, if Windows FILETIME is measured in UTC then chrono::file_clock should > use that too. So we might want to use a custom implementation of > chrono::file_clock for Windows. And replace its from_sys/to_sys members with from_utc/to_utc.
