It was June 21, 1994.
I too wonder who called the cops to Martin's house, because I agree it seems unlikely it was Jeanette. On the one hand, if she wanted to do the right thing, calling an anonymous tip would avoid her having to admit that she found out by breaking into the man's house. On the other hand, her scared reaction in the first episode when she learned that Kate had been found alive didn't seem like that of a person who had initiated that rescue.
I'm glad we got some explanations for things, though. Jeanette's reaction, for one. Now it makes sense why she seemed scared. Sh