Silent object appears to be flying towards the shore of the Pacific Ocean

I was visiting my Army buddy who lived in Monterey after returing from Vietnam.  We were walking his dog on the shore of Monterey Bay at around 8 p.m.  A soundless light was approaching from the west at a moderate speed.  
As it grew closer a second light eminated from a different part of the craft.  When I thought about this later, it appeared that we may have been "scanned", or something to that effect.  It made a sharp left turn and continued up the coast.
When my friend checked his watch after the craft left our field of vision he noticed that we had lost around a half hour in time.  
At this late date, I don't remember how I felt afterwards, but I do know that I felt different after that.