Seen a lot of debate over major or minor chords, this way sounds right to me though,
taking the vocal melody into account.

I use the Bm(add11) to replicate the prominent bit of lead guitar that you hear in the original.

Chords used (capo on 1):
D:         x00232
A:         x02220
G:         3x0033
Bm:        x24432
Bm(add11): x24430
Em:        022000
F#:        244322
C#:        446664


[Intro]
   
   
   
   

[Verse]
            
 Today is the 

        
greatest day I

've ever known
            
 Can't live fo

             
r tomorrow, to


morrow's much 

too long
            
 I'll burn  my

          
 eyes out
          
 Before I get 

    
out

[Chorus]
           
  I wanted mor

   
e
           
  Than life co

           
uld ever grant


 me
           
  Bored by the

       
 chore
           
  Of saving fa

   
ce

[Verse]
            
 Today is the 

        
greatest day I

've never know

n
            
 Can't wait fo

             
r tomorrow, I 


might not have

 that long
            
 I'll tear  my

           
 heart out
          
 Before I get 

    
out

[Chorus]
           
  Pink ribbon 

           
scars that nev

er forget
           
  I tried so h

         
ard  to cleans

e these regret

s
           
  My angel win

         
gs were bruise

d and restrain

ed
           
  My belly sti

    
ngs

[Bridge]
           
 Today is - To

 
day is
           
 Today is - th

    
e greatest
         
daaay oo oo oo

h
        
Oo ooo ooh

    

[Chorus]
           
  I want to tu

           
rn you on
           
  I want to tu

           
rn you onnn
           
  I want to tu

           
rn you on
          
  I want to tu

rn you

[Outro]
            
 Today is the 

       
greatest
            
 Today is the 

       
greatest  day
            
 Today is the 

       
greatest  day 

that-
          
 I have  - eve

           
r - really kno

wn