Is there a best time of day/week to gamble?

Is there a best time of the day or day of the week to gamble? Do the machines know the day and time and adjust there odds accordingly? I have this theory that games adjust depending on if it is a Tuesday night vs. a Saturday night where Saturday they have worse odds vs. Tuesday where they have better odds because less people are playing. I am more specifically inquiring about Video Poker and Video Blackjack machines, the two types that I play and sort of trust. I personally don't play slots due to the fact that I have trust issues with the machines and the legitimacy surrounding them but if there is anyone who plays slots and has any information about them and when/how is the best way/time to win your opinion would also be greatly appreciated. Thank you.