Ok these are the original Stevie Wonder chords. For a while a reharmonized
chords by Jack Johnson have been lying around, 
and people were learning the wrong chords all this time. 
(Something like C, Cmaj9, Am, F, eeeew). 
Forget about these, here is the real stuff:
Song has three shifts by a semitone, but you can stay in 
Amajor all the way, and use the following ending 
"Hm,E,A; D,E,A"
Otherwise here is the full song:

A (x02220@1)                  E/G#Someday (143121@4)at Christmas men won't be boys
Em/G (322000@1)                  DPlaying (xx0232@1)with bombs like kids play with toys
Dm (xx0231@1)                  AOne (x02220@1)warm December our hearts will see
Hm (x24432@1)          E (022100@1)     Hm (x24432@1)     E7A (020130@1)world where men are free   mmmmmm

A (x02220@1)                  E/G#Someday (143121@4)at Christmas there'll be no wars
Em/G (322000@1)                     DWhen (xx0232@1)we have learned what Christmas is for
Dm (xx0231@1)                     AWhen (x02220@1)we have found what life's really worth
Hm (x24432@1)        E (022100@1)         AThere'll (x02220@1)be peace on earth

(up by semitone)
Bb (x1333x@1)                      F/ASomeday (x03211@1)all our dreams will come to be
Fm/G# (113111@1)                  D#Someday (x43121@3)in a world where men are free
D#m (xx4342@1)              BbMaybe (x1333x@1)not in time for you and me
Cm (x3101x@1)           F (133211@1)      BbBut (x1333x@1)someday at Christmastime

Bb (x1333x@1)                 F/ASomeday (x03211@1)at Christmas we'll see a Man
Fm/G# (113111@1)             D#No (x43121@3)hungry children, no empty hand
D#m (xx4342@1)             BbOne (x1333x@1)happy morning people will share
Cm (x3101x@1)            F (133211@1)     Cm (x3101x@1)    F7Our (131241@1)world where people care    ooooooooh

Bb (x1333x@1)                 F/ASomeday (x03211@1)at Christmas there'll be no tears
Fm/G# (113111@1)               D#All (x43121@3)men are equal and no men have fears
D#m (xx4342@1)                  BbOne (x1333x@1)shinning moment my heart ran away
Cm (x3101x@1)      F (133211@1)     BbFrom (x1333x@1)our world today

(up by semitone)
B (x2444x@1)                     F#/Bb
Someday all our dreams will come to be
F#m/A                    ESomeday (022100@1)in a world where men are free
Em (022000@1)                  BMaybe (x2444x@1)not in time for you and me
C#m (x13321@4)          F# (244322@1)      BBut (x2444x@1)someday at Christmastime

C (x32010@1)                     G/BSomeday (143121@7)at Christmas man will not fail
Gm/Bb                   FTake (133211@1)hope because your love will prevail
Fm (133111@1)                    CSomeday (x32010@1)a new world that we can start
Dm (xx0231@1)       G (320003@1)      Dm (xx0231@1)    G7With (320001@1)hope in every heaaaaaaart  yeah

C (x32010@1)                     G/BSomeday (143121@7)all our dreams will come to be
Gm/Bb                   FSomeday (133211@1)in a world where men are free
Fm (133111@1)                    CMaybe (x32010@1)not in time for you and me
Dm (xx0231@1)       G (320003@1)      CBut (x32010@1)someday at Christmastime
F (133211@1)        G (320003@1)      CSomeday (x32010@1)at Christmastime 

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