Was running DateLine on a MacBook Pro with El Capitan. Just switched to a new machine running Mojave and brought DateLine across via the Migration Assistant. It opened and is running as per usual. So perhaps not dead as reported 18 months ago. Needless to say, I'm delighted. There's no other desktop calendar app that looks and works quite like this one. I don't need a replica of my regular calendar app (BusyCal) on my desktop, I just want that discreet, linear view across the bottom of my screen when I want to consult a visual calendar. (I rarely use the click-to-see-what's-on today function, although that's nice too.)