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dhtmlxScheduler

In the current version, if you create an event from 0:00 to 23:50 on a given day, then drag the event down to the bottom so it would be an all day event, it overreacts and creates a really long event off the grid spanning a couple of days.

A similar issue occurs if you drag an event which lasts a couple of hours to the bottom of the scheduler. The result is an event which hangs off the bottom of the control. Interestingly, if you drag it completely off the bottom and let go, it moves the event to the next day.

Problem confirmed and fixed , fix will be released as part of next build. 
If you need the fix ASAP - you can try to use attached js file instead of original one.