question: public static long unixTimestamp ( UUID uuid ) { if ( uuid . version ( ) != 1 ) { throw new IllegalArgumentException ( String . format ( "Can only retrieve the unix timestamp for version 1 uuid (provided version %d)" , uuid . version ( ) ) ) ; } else { return uuid . timestamp ( ) / 10000L + START_EPOCH ; } }
target:  Get the unix timestamp encoded in a time-based (type 1) UUID.