What you can do i use Calendar
class to get the current time. Check the time and display the toast accordingly.
Calendar currentTime = Calender.getInstance();
int hour = currentTime.get(Calendar.HOUR_OF_DAY);
if(Use your condition here) {
Display toast
} else if(Use your other condition) {
Display toast
}
Just a note, your hour
would be in 24 hour format so you need to check keeping that in mind.
solved How to set specific time in Toast?