This Modification adds one block and one achievement , the block allows you to set the time to zero without accessing commands. The crafting recepie is:
D=Diamond [Not ore or block]
B=Bed
W=Watch
E=Empty space
CRAFTING
[E][D][E]
[E][W][E]
[E][B][E]

Want to know how to get the achievement?
-Time Flies'
even though it says "place the block of flowing time"
you need to right click it.
[spoiler=INSTALLATION]And then start up minecraft.[/spoiler]