Hi Kathy,
I apologize for the delay in responding.
I am afraid that I am not able to reproduce the issue specified by you.
Attached is a sample with a scheduler control,
http://websamples.syncfusion.com/samples/Tools.Web/5.1.0.51/Forum-66519/main.htmIn the sample 'Appointment3' starts at 01:00:00 AM on '21-04-2007', you could notice that it appears only on the date '21-04-2007'and it is not to filled its previous date '20-04-2007'.
Could you please reproduce the issue in the above attached sample and send us a video demo for the issue?
If you can, please send the sample in which you are facing the issue, so that it will be more helpful for us to resolve the issue.
Thank you for your patience.
Regards,
Valli