This is the First tab I posted, I couldn't find the proper tab anywhere so I had to 
watch his Live video to find out how it's really played.
This will get you started and the rest is pretty simple to ear out once you have the 
chords. And the intro to the chorus may be a little off.

His youtube video can help you figure the rest out if you can't ear it http://youtu.be/HOdfx4DpQWg

CHORDS:

Bm  (x24432)

A   (002220)

G   (320033)

Em  (022000)

A2  (002200)

Bm7 (020202) - optional to use during verses instead of Bm


                   Bm
It's been a bad day
                      A
You've been looking back
                 G
And all you can see
                                       Em
is everything you wish you could take back
                  Bm
All your mistakes
                   A
A world of regrets
                        Em                     G
All of those moments you would rather forget

                 Bm           A
I know it's hard to believe
                Em              G
Let me refresh your memory


[Chorus]
         D      A       G
Yesterday is history
      A  Bm      A      G
And history is miles away
       D         A
So, leave it all behind you
             A2     G          A
But let it always remind you of the day
G
The day that love made history
D G Bm A


                    Bm                     A
You know you can't stay right where you fell
                        G              Em
The hardest part is forgiving yourself
                      Bm           A
 But let's take a walk into today
                                 Em        G
And don't let your past get in the way