I have a date picker and 4 time pickers in my application. I want to display a notification at given date at all the 4 times given by the user. How do I do it?

I store the all the values separately as integer in my database like year, month, dayofmonth, hour of time 1, minute of time 1.... But there must be some other way to do that display notification right?

Also I have a field asking how many days I want to display notification. So that notification will be displayed for every time I have given to the end of number of days
.