Reduce the time between reading millis and nanos, to avoid problems if the…

Reduce the time between reading millis and nanos, to avoid problems if the timestamp is concurrently updated.

h2/src/main/org/h2/value/ValueTimestamp.java

@@ -66,9 +66,9 @@ public class ValueTimestamp extends Value {
      */
     public static ValueTimestamp get(Timestamp timestamp) {
         long ms = timestamp.getTime();
+        long nanos = timestamp.getNanos() % 1000000;
         long dateValue = DateTimeUtils.dateValueFromDate(ms);
-        long nanos = DateTimeUtils.nanosFromDate(ms);
-        nanos += timestamp.getNanos() % 1000000;
+        nanos += DateTimeUtils.nanosFromDate(ms);
         return fromDateValueAndNanos(dateValue, nanos);
     }