Java Time

Okay guys, I ask a time (hour, minutes, seconds) to the user.
Should I make my own time class and implement Comparable or should I shitdive in Date/Calendar/GregorianCalendar?

thanks

>>2
Uninspired. I wouldn't even give that a troll rating because it's just plain terrible.

Okay guys, I ask a game engine (sound, video, input) to the user.
Should I make my own engine class and implement DirectX or should I shitdive in SDL/OpenGL/DirectX?