fix: incorrect timestamp in uuid v6 (#161)

Author: ls4154

time.go

@@ -113,7 +113,9 @@ func (uuid UUID) Time() Time {
 	var t Time
 	switch uuid.Version() {
 	case 6:
-		time := binary.BigEndian.Uint64(uuid[:8]) // Ignore uuid[6] version b0110
+		time := int64(binary.BigEndian.Uint32(uuid[0:4])) << 28
+		time |= int64(binary.BigEndian.Uint16(uuid[4:6])) << 12
+		time |= int64(binary.BigEndian.Uint16(uuid[6:8]) & 0xfff)
 		t = Time(time)
 	case 7:
 		time := binary.BigEndian.Uint64(uuid[:8])

version6.go

@@ -39,12 +39,16 @@ func NewV6() (UUID, error) {
 	   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 	*/
 
-	binary.BigEndian.PutUint64(uuid[0:], uint64(now))
+	timeHigh := uint32((now >> 28) & 0xffffffff)
+	timeMid := uint16((now >> 12) & 0xffff)
+	timeLow := uint16(now & 0x0fff)
+	timeLow |= 0x6000 // Version 6
+
+	binary.BigEndian.PutUint32(uuid[0:], timeHigh)
+	binary.BigEndian.PutUint16(uuid[4:], timeMid)
+	binary.BigEndian.PutUint16(uuid[6:], timeLow)
 	binary.BigEndian.PutUint16(uuid[8:], seq)
 
-	uuid[6] = 0x60 | (uuid[6] & 0x0F)
-	uuid[8] = 0x80 | (uuid[8] & 0x3F)
-
 	nodeMu.Lock()
 	if nodeID == zeroID {
 		setNodeInterface("")