Here's an idea: plan something nice to do on the 14th. That way, when WW3 doesn't materialise on Saturday (it had better not: it's Eurovision on Saturday night!)

you can celebrate by doing something nice on Sunday.
There's no such thing as a mystical prophet or a 'messenger of god'; as others have said they're all a bunch of charlatans and they've all been proven wrong every single time. They get off on whipping up hysteria amongst their followers: both as a way of making money, and as a way of stroking their own egos. Many of them are later proven to be either sociopaths or psychopaths, which makes them very good at manipulating people. Pay them absolutely no mind... and when you wake up on Sunday to see that the world hasn't erupted in chaos (at least, no more than usual!), use this as evidence that such claims should always be taken with a
massive pinch of salt.
FWIW, I also foresaw the election of Donald Trump: I told my daughter last summer that politics tends to swing from one extreme to another, and that Obama's policies had been too left-wing for Trump-supporting types so they'd come out in droves to vote him in and swing the pendulum back in their direction. Likewise, I hereby predict that Trump will be a one-term president because he's too right-wing for the Obama-supporting types, so they'll do the same thing next time & will vote him out. If I'm proven right about Trump being a one-term president, would you think I'm a prophet? And what would you think if I'm wrong?
I'm definitely not a messenger of any gods though... I just used common sense & guessed correctly! Exactly like your 'prophet' did. Of course he'll brag after-the-fact about any of his guesses that turned out to be correct... but ask yourself this: how many times has he guessed
incorrectly, and why doesn't he mention all of those incidences? I bet he's wrong far more than he's right, but he just keeps quiet about it. We can all throw a bunch of guesses against a wall and one or two will stick!
Seriously, do yourself a favour & stop researching this subject: you're only upsetting yourself. And even if one of these predictions came true, is there anything you can do about it? No... so why worry yourself?