sorry for reviving an old thread, but just to clarify for anyone else, I believe the problem you're having is that a period of 720 is used. Thats 12 hours. So, basically, your first event would work. However, it would change the next hour for the "day spawn" event to occur in the database occur at the same time as the "night spawn" event. So ultimately, your events are occuring as they should, but since ALL 4 events would then occur at 18:00, they're ultimately cancelling each other out.
Based on that, I believe the simple fix is to just change period for each event to 24 hours or 1440.
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