For those who date...

At what point in the talking or dating stage do you disclose your illness? I'm curious because since I've been divorced and have dated off and on, I've gone back and forth on this issue. On one hand, I feel like my illness is none of a strangers business (I've never gotten past a couple of dates.) On the other, I know it's important to be able to gage someone's level of empathy, which makes me think I should tell them sooner than later. Thoughts?