i think you have to multiply the Unix time by 1000 because Unix time is in Seconds but the "date" takes milliseconds.
also the output should also contain time 08/26/2015 @ 3:59pm
The CLI output he quoted must be in milliseconds then, because I only took the blockTime variable, plugged it into the command, and formatted it the way he wanted. It looks like he only wanted the date so I cut out the time.