Enter, SLN checker. The time schedule is updated like once a day and it seems like schedule finder is never updated. You can click on the SLNs on the time schedule to get real-time informatin about them, but if you're looking for any large number of SLNs, this becomes a pain in the ass. I think I may be able to offer a solution.
It's not amazing, and I'm still sort of working on it, but it functions as it is.
Let me know if you see places for improvement or glitches in general.