Get FILETIME and convert posix time to windows FILENAME

filetime.nim

const EPOCH_DIFF = 11644473600'i64

type FILETIME = object
  dwLowDateTime: uint32
  dwHighDateTime: uint32

proc toFileTime(tv: Timeval): FILETIME =
  var mtime = EPOCH_DIFF + tv.tv_sec.int64
  mtime = mtime + tv.tv_usec * 10;
  mtime = mtime * 10_000_000
  result = cast[FILETIME](mtime)

proc getLastWriteTime(file: string): FILETIME =
  var
    res: Stat
    tv: Timeval
  if stat(filename, res) < 0'i32: raiseOSError(osLastError(), file)
  tv.tv_sec = res.st_mtime
  result = toFileTime(tv)