electrical issue

Yesterday I experienced some problems. It started out after getting gas, I filled up and then went to start the truck, turned the ignition and nothing happened then tried it again right away and it fired right up. After it started up i noticed the clock was off by 6 hours when it was the right time before this happened.
Then night came around and I then noticed that the headlight seem to cut out when i hit the brakes and one time i even noticed that the speedo droped from 40mph down to 0mph for a split second. I checked the battery and everything is tight so I don't really know what it could be.

Truck info:
2010 Double Cab offroad
31,000 miles

 

That sounds like a grounding issue somewhere- Have you had any new electrical systems installed??

-or-

Still inside warranty- Let them look at it??

 

I haven't had anything new with the electrical. I did have it in for an oil change and an alignment a couple days ago

 

Check the ground strap on the engine to frame

 

Also check the tightness of the negative battery cable to its point of connection

 

the negative battery cable is tight

 

x2 on having the dealer look at it.

 

I had an issue where I had to turn the key twice to get it to start. It was a constant problem and not intermittent like yours. I had to get the alternator replaced. If your clock reset though, It sounds like its because you lost continuity with your battery. Maybe there is a short around there?