Firebase iOS Swift日期和时间

I was wondering if what I want is possible and if so if somebody could point me in the right direction. What I want is to SET a date for something to happen, and then when that time comes some piece of code gets executed...for example it sends a notification and when the app is opened and the notification is tapped another piece of code is ran...but that code could not run unless the date and time has come.I was wondering if what I want is possible and