Daylight Savings Time starts on the 8th (Sunday) for applicable parts of North and Central America, and clocks will advance an hour untill November. This means Citivai, which resets its "day" at midnight UTC, will occur an hour after what you're used to since UTC does not adjust for DST. e.g., Your daily blue buzz limits will reset at 8:00 PM New York time instead of 7:00 PM New York time. I've seen statistical analysis articles showing that midnight UTC is one of Civitai's peak periods, and I know many schedule around that so be advised of this shift.
Applicable countries in Europe (plus Greenland) are the same except starting the 29th.
(It's a small thing, but with so many clocks that auto-adjust now, because everything has a computer and wifi for some reason yet stoves and microwaves still don't have a backup battery, I genuinely see people get tripped up every year, plus I don't think Civitai's reset time being midnight UTC is ever officially actually stated anywhere)