Chords: 
  G#m    B     D    D#m   F#m    A     C    C#m
E|-4-----2-----5-----6-----2-----0-----3-----4----|
B|-4-----4-----7-----7-----2-----2-----5-----5----|
G|-4-----4-----7-----8-----2-----2-----5-----6----|
D|-6-----4-----7-----8-----4-----2-----5-----6----|
A|-6-----2-----5-----6-----4-----0-----3-----4----|
E|-4-----------------------2----------------------|

The whole song follows the same pattern, so once you learn the intro, you pretty much know the song. 

Intro:
The chords are played behind the lead pattern. 

   G#m                      B                        D                        D#m
E|-4-----2-----4---| e|-4-----2-----4---|     e|-4-----2-----4---|     e|-4-----2-----4---|
B|---4-----4-----4-| x4  B|---4-----4-----4-| x4  B|---2-----2-----2-| x4  B|---2-----2-----2-| x4
G|-----4-----4-----| G|-----4-----4-----|     G|-----2-----2-----|     G|-----3-----3-----|
D|-----------------| D|-----------------|     D|-----------------|     D|-----------------|
A|-----------------| A|-----------------|     A|-----------------|     A|-----------------|
E|-----------------| E|-----------------|     E|-----------------|     E|-----------------|

   F#m                      A                        C                        C#m
E|-2-----0-----2---| e|-2-----0-----2---|     e|-2-----0-----2---|     e|-2-----0-----2---|
B|---2-----2-----2-| x4  B|---2-----2-----2-| x4  B|---1-----1-----1-| x4  B|---2-----2-----2-| x4
G|-----2-----2-----| G|-----2-----2-----|     G|-----0-----0-----|     G|-----1-----1-----|
D|-----------------| D|-----------------|     D|-----------------|     D|-----------------|
A|-----------------| A|-----------------|     A|-----------------|     A|-----------------|
E|-----------------| E|-----------------|     E|-----------------|     E|-----------------|

Verse:
Play the above along with the lyrics. Use the chords to guide you.

     G#m
     No time before it's too soon
     B
     No time after it's too late
     D                   D#m
     Time's getting old, time's over now
     F#m
     Don't try to be on time
     A
     Don't try to run after time
     C                  C#m
     Time's getting on, time's over now

Chorus:

           G#m
     I'm a little boy, you're a little girl, once upon a time
           B
     I'm a little boy, you're a little girl, once upon a time
     D                   D#m
     Time's getting on, time's over now
           F#m
     I'm a little boy, you're a little girl, once upon a time
           A
     I'm a little boy, you're a little girl, once upon a time
     C                  C#m
     Time's getting on, time's over now