如果它超过javascript中的特定时间，则添加一天到目前为止

Here's my code for getting the time after adding specific time.. I don't know how to shift to tomorrow's date if the base_time is example: 4:50 PM and the 'default END TIME' is only 5:00 PM and I have to add 30 mins on the base_time. If I add 30 mins on the base, the Here's my code for getting the time after addin