Great song, easy to play on acoustic.  I've looked at the other tabs and they 
don't quite seem right, I think this one sounds the best.  This is my first tab, enjoy!

Cm      x33210
C       x32010
G       320033
Am      x02210
Dm      xx0231

Cm         C     
Whenever I look back
     G                     Am
On the best days of my life
Cm          C                G  Am   
I think I saw them all on T.V.
Cm       C
I am so homesick now for
G                   Am  
Someone that I never knew
Cm       C
I am so homesick now for
G                Am 
Someplace I will never be

Cm   C            G   
Time won't let me go
Cm   C            G
Time won't let me go
Cm               C
If I could do it all again
G
I'd go back and change everything
Cm       C            G
But time won't let me go

Cm           C           G    Am
I never had a 'Summer of 69'
Cm                 C             G    Am
Never had a Cherry Valance of my own
Cm                 C
All these precious moments
G                          Am
You promised me would come in time
Cm           C               G    Am    
So where was I when I missed mine?

Cm   C            G
Time won't let me go
Cm   C            G
Time won't let me go
If you gave me back those years
I'd do it all better I swear
Time won't let me go

Cm    C    G  Am  (do this about 2x)
Ba ba ba ba ba...

Dm                C
If I could go back once again
                         G
I would change everything, yeah
Dm                C
If I could go back once again
                      G
I'd do it all so much better...

Cm   C            G
Time won't let me go
Cm   C            G
Time won't let me go
If I could do it all again
I'd go back and change everything
But you won't ever let me go

Cm    C    G  Am
Ba ba ba ba ba... 

Dukes