code: public static Date getDateFromUniqueId(long uniqueId) {
          long time = uniqueId >> (COUNTER_BITS + PARTITIONID_BITS);
          time += VOLT_EPOCH;
          return new Date(time);
      }
docs: Given a unique id, return the time of its creation
  by examining the embedded timestamp.
  @param uniqueId The unique id value to examine.
  @return The Date object representing the time this unique
  id was created.