Seeig sequences of numers like 111 and 333

I tried to search for this but didn't find any thread about this.

for about 3 weeks now, I've seen 11:11, 1:11, 333, 3:33, everywhere, I read somewhere that those are good things, but.. what do they mean? I see it on the clock, on bills when I have to pay, and well, many other random locations. Those both series. I'm really curious, thought this was the perfect place to ask.. (I google about it but I found so many different meanings)