Fix date variant to time.Time conversion

* Fix VariantTimeToSystemTime call
* Add time.UTC as a default Location

Author: ilyaglow

com.go

@@ -321,9 +321,9 @@ func DispatchMessage(msg *Msg) (ret int32) {
 // GetVariantDate converts COM Variant Time value to Go time.Time.
 func GetVariantDate(value float64) (time.Time, error) {
 	var st syscall.Systemtime
-	r, _, _ := procVariantTimeToSystemTime.Call(uintptr(unsafe.Pointer(&value)), uintptr(unsafe.Pointer(&st)))
+	r, _, _ := procVariantTimeToSystemTime.Call(uintptr(value), uintptr(unsafe.Pointer(&st)))
 	if r != 0 {
-		return time.Date(int(st.Year), time.Month(st.Month), int(st.Day), int(st.Hour), int(st.Minute), int(st.Second), int(st.Milliseconds/1000), nil), nil
+		return time.Date(int(st.Year), time.Month(st.Month), int(st.Day), int(st.Hour), int(st.Minute), int(st.Second), int(st.Milliseconds/1000), time.UTC), nil
 	}
 	return time.Now(), errors.New("Could not convert to time, passing current time.")
 }