I am working with Fullcalendar and displaying build data in the calendar. Here only one data where the time of build is passing 11.00 pm, is getting merged to next date and also the color is changing.
attached screenshot.

I have checked in database too. when I change the time to 22.59 it is working fine even color is correct.but when i change to 23.01 the issue occurs again.

Please suggest where i am missing.

I tried changed colors through css and also tested by changing the time to 22.00 and got to know it is happening because of the time.