diff --git a/ipfix/interpret.go b/ipfix/interpret.go
index 515a2703..1001f4d6 100644
--- a/ipfix/interpret.go
+++ b/ipfix/interpret.go
@@ -63,8 +63,10 @@ func Interpret(b *[]byte, t FieldType) interface{} {
 		return string(*b)
 	case Ipv4Address, Ipv6Address:
 		return net.IP(*b)
-	case DateTimeSeconds, DateTimeMilliseconds, DateTimeMicroseconds, DateTimeNanoseconds:
-		return int64(binary.BigEndian.Uint64(*b))
+	case DateTimeSeconds:
+		return binary.BigEndian.Uint32(*b)
+	case DateTimeMilliseconds, DateTimeMicroseconds, DateTimeNanoseconds:
+		return binary.BigEndian.Uint64(*b)
 	case Unknown, OctetArray:
 		return *b
 	}