Answer:
Goes over all the hills and hollows, Bites hard, but never swallows.
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. What am I?
Man walks over, man walks under, in times of war he burns asunder. What is it?
When you stop and look you can always see me. If you try to touch you cannot feel me. I cannot move but as you near me I will move away from you.
My rings are not worth much, but they do tell my age. What am I?
No matter how little or how much you use me, you change me every month.