I haven't noticed such thing yet but casinos track their daily performance and based on that, algorithm, pattern being changed for their users after specific time later or this is how casinos program work. That's why gamblers winnings or lossing ratio is increase than others day. For example, someday i keep winning more and some day i keep losing more and more while strategy is same what i apply during play. Otherwise i don't have such experience as you told. It might be your imagination or coincidence
I think it might just be someone's estimation after seeing his gambling times so that he thinks he can win at certain times. Even though that's not what makes him win because in gambling, we don't know when we can win and lose. We can only try to win even though the result is that we will lose on certain days. And we also can't say we will win in a certain month because there is no such guarantee. And instead of thinking about things we don't know for sure, we should gamble as we can and enjoy the moments of gambling so that we won't focus on things like that. There may be gamblers who believe in superstitious things like that but for other gamblers, they will not believe it.
That why in gambling there is no such thing as an absolute win for gamblers because there is no time or anything that can guarantee an accurate win except luck and no matter how long someone gambles when they are having a bad day they will also suffer defeat after defeat never expected.
Winnings sometimes come without us realizing it and some people don't think about things like this because they are too confident or ambitious about winning at gambling.
But I once found a gambler who really had a very high belief and suggestion towards a certain day to gamble which could bring good luck but I thought it was all just superstition or empty talk because day like that only come a few times in 1 year so it is impossible for someone to only rely on that day to gamble.
I myself have known gambling for quite a long time but have never once had a lucky day that I can really rely on because I know that luck comes unexpectedly and several times I got lucky after experiencing defeat and from this I assume that there is no particular time that will happen guarantee someone victory.