Most Helpful Guy
I think its whenever you feel ready, however if the relationship lasted a year I would say wait a month just so it doesn't reflect poorly on you or him (if there was an amicable break you woulnd't want it to seem like you are glad there gone because it would be rather hurtful).
Most Helpful Girl
Forget how long. Is there someone who is pursuing you right now that you find yourself interested in? Why worry about when to date if you haven't met someone compelling enough to want to take it to that level? I'm not one for clubs but don't go there to meet someone. And I hope you are refraining from hooking up with guys there as it is a double edged sword. If you believe you are worth something, you wouldn't allow just anyone to handle you. Girls who are easily available even if it stops at kissing are diminishing the strength of relationship for themselves and guys as well as teaching guys that girls are all after one thing but not worthy mates. Go to a club because you find the atmosphere fun and something you want in your life. Do the things you want in your life. Life is more than love and in fact, love is more than romantic love. Wait for someone who cherishes you and you want to cherish. That is when to date.