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This works for things that have happened. It doesn't work too well for schedules. In those cases, the timezone of the source matters, heavily.

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For example, a task that occurs "daily at 15:00" does not always happen every 24 hours. When DST comes into effect, the interval shortens to 23 hours once.

Or, at "2:30 am" in the continental US can occur twice in a day, or not at all. Of course, even that isn't guaranteed, if you're in AZ.

Even "notify me in exactly 24 hours has its own complications. Leap seconds will screw up your day (as will the vague request of "exactly 24 hours").

Corner cases, the bane of simplicity everywhere.

To this day, knock on wood, I have had success at voluntarily avoiding those issues ^^ (aside from school assignements)

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