What came first, Today or Yesterday

What came first, 'Today' or 'Yesterday'?

To this a layman might answer, yesterday.
Explain a bit to him. Tell him, that question is not 'Which' came first but 'what' came first. The point is, that question is not specific, to any day. As in this day came first or yesterday came first. But it is more of a sort whether today is earlier than yesterday.
There are 2 ways to answer the question. And both give the same answer.
1. If we think every yesterday was once today, that will lead us to following scenario:
as every yesterday was today before the beginning of this day, hence Today come first than yesterday. This thought can be developed further by saying that, the every "Today" ends on 12:00 midnight, and that day become yesterday, while a new day begin as "Today". Hence, except on exact 12:00 midnight when old today has expired but new Today is yet a nano-second away, except this scenario at any point of time there will be "X" number of yesterdays and "X+1" number of today. Hence proving that Today come first and hence are more in numbers.

2. Secondly we can alternatively say that to know what come first we must know what came first. Hence we can take that as base and answer accordingly. To know what came first we must go as long back as possible. We must go to the very earliest point in time. We must go the the beginning of time. The beginning of time as we know today is the Big Bang. So if time has a beginning, then there will a scenario that, when big bang happened there was a today, but not yesterday. Because the was no time before big bang. So Today came earlier than yesterday. hence Today come first than Yesterday.