The timestamp value associated with this UUID.
The 60 bit timestamp value is constructed from the time_low,
time_mid, and time_hi fields of this
UUID. The resulting
timestamp is measured in 100-nanosecond units since midnight,
October 15, 1582 UTC.
The timestamp value is only meaningful in a time-based UUID, which
has version type 1. If this
UUID is not a time-based UUID then
this method throws UnsupportedOperationException.
|If this UUID is not a version 1 UUID|