I've got an urban fantasy story set a few decades ago that heavily involves vampires and werewolves, and as such, when exactly the sun and moon were out on a given day is important information for me to know when telling the story. Of course, the issue is that this constantly changes due to various factors that don't precisely sync with the 24 hour clock or even a yearly calendar, causing the moon to be out at different times on different days on different years, which would be excruciatingly difficult to keep track of by hand. Thankfully, since the sun and moon are very real things and the subjects of intense study, there are websites that thoroughly keep track of these things throughout a huge amount of recorded history, and I can easily find out with a quick google search when exactly the sun and moon were out on a given day, what lunar phase it was, etc.
But the issue comes if I want to keep track of such things for something that doesn't exist.
Suppose, for example, I wanted to add a system to my setting where every 25 hours, time temporarily stops for an hour for almost everything in my setting that isn't magical. This would obviously mean that this event would happen at a different hour of the day every day, and keeping track of what time it would happen each day in a story that takes place over the course of months or even years would be... exhausting.
Is there some sort of tool out there that would let me keep track of this? Maybe some software designed for worldbuilders to make fictional calendars for sci-fi stories with their own fictional suns and moons and planets with their own rotations and revolutions?