This is my first tab, and I'm 99% sure this is correct. I hope you enjoy!

INTRO: (I think the chord in the background is D over and over)

E -------------------------|
B --------------------10~--|
G --7~-7-9-11-12-9~-7------|
D -------------------------|
A -------------------------|
E -------------------------|

FIRST VERSE:

D                                  A
Wednesday I came home from school, did my homework in my room 

Bm                      G
then I watched some TV, I still miss you. 

D                             A
Thursday morning went online, got to school at half past nine 

Bm                     G
wound up in detention, I still miss you. 

Pre-Chorus:

Bm           A
Everything I do (oh) 

Bm                G
brings me back to you. 

CHORUS:

      D                 A
And I die, one day at a time 

        Bm                 A              G
cause I just can't seem to get you off my mind, 

                D                    A
no matter how I try, try to kill the time. 

       Bm                  A           
Well I think that I'm just going crazy 

G
 one day at a time. 

POST-CHORUS: (D in background)

E -------------------|
B --------10~--------|
G --9~--7------------|
D -------------------|
A -------------------|
E -------------------|

SECOND VERSE:

D                        A
Friday I got out of bed, tried to smile frowned instead 

Bm                               G
burned some toast for breakfast, I still miss you. 

D                          A
Saturday I turned sixteen, never dreamt you'd act so mean, 

Bm                       G
you didn't even call me, but I still miss you. 

PRE-CHORUS 2:

Bm                     A
And when I turn ninety-four,

Bm                         G 
I think I'll miss you even more. 

CHORUS 2:

      D                 A
And I die, one day at a time 

        Bm                 A              G
cause I just can't seem to get you off my mind, 

                D                    A
no matter how I try, try to kill the time. 

       Bm                  A           
Well I think that I'm just going crazy 

G                     F#m
 one day at a time. 

BRIDGE:

           F#m
I miss you more than I did a minute ago, 

Em                                          A2
I'd climb a mountain just to here your echo (you, you). 

Bm
All I wanted was you. 

        F#m
Tell me please do you think of me now and then? 

Em
Cause if I never see you again, 

A2           Bm
I still miss you. 

FINAL CHORUS:

      Em                Bm
And I die, one day at a time 

        C#m                Bm              A2
cause I just can't seem to get you off my mind, 

                Em                   Bm
no matter how I try, try to kill the time. 

       C#m                 Bm             A2           
Well I think that I'm just going craaaaazy 

OUTRO:                   

             Em
One day at a time.    

    Bm
Oh, one day at a time. 

       C#m                Bm    A2
Well I think that im just going craaaaaazy. 

             Em
One day at a time. 

    Bm                   C#m     Bm     A2
Oh, think im going crazy ooooooo-oooooo-ooooo 

                 Em
Oh, One day at a time.