Coding Around The Clock
GolfScript, 11 10 bytes

21;;3#9];6


Uses # as padding character.

12 o'clock

6
;
]
9
#
3
;
;
1
2


Try it online!

How it works.


6 is pushed on the stack, ; discards it.
] wraps the stack in an array (does not affect output).
9 and 3 are pushed on the stack, ; and ; discard them.
Finally, 1 and 2 are pushed on the stack, and implicitly printed without separation.


3 o'clock

6
;
]
9
#
3
;
;
1
21;;3#9];6


Try it online!

How it works


6 is pushed on the stack, ; discards it.
] wraps the stack in an array (does not affect output).
9 and 3 are pushed on the stack, ; and ; discard them.
1 and 21 are pushed on the stack, ;; discards them.
3 is pushed on the stack.
# begins a comment until the end of the line.


6 o'clock

6
;
]
9
#
3
;
;
1
2
1
;
;
3
#
9
]
;
6


Try it online!

How it works


6 is pushed on the stack, ; discards it.
] wraps the stack in an array (does not affect output).
9 and 3 are pushed on the stack, ; and ; discard them.
1, 2 and 1 are pushed on the stack.
; and ; discard the last 1 and 2.
3 and 9 are pushed on the stack.
] and ; wrap the stack in an array and discard it, clearing the stack.
6 is pushed on the stack.


9 o'clock

#########6
#########;
#########]
#########9
##########
#########3
#########;
#########;
#########1
6;]9#3;;12


Try it online!

How it works


All lines but the last are comments.
6 is pushed on the stack, ; discards it.
] wraps the stack in an array (does not affect output).
9 is pushed on the stack.
# begins a comment until the end of the line.