"Today Is Yesterday's Tomorrow" is, in my opinion, one of the least popular renditions by Michael Bublé, not that I am an authority on his songs. The title seems straight forward enough. Or, is it? Someone analyzed it this way. Technically, "today is the day that was yesterday's tomorrow". So, shouldn't it be, "Today was yesterday's tomorrow"? I am not a grammarian either, so we leave it at that. Meanwhile, someone made a riddle out of it:
A teacher enters class and says, “If only yesterday was tomorrow then today would be Saturday." What day of the week did the teacher speak of?
A logician/grammarian had one idea. First, he thought there were two answers - Either today is Thursday or Monday - depending on what "proper" grammar were used. Here is the quote:
"Edit: Today is Thursday. Tomorrow is Friday. If yesterday had been tomorrow (Friday) then today would be Saturday
Today is Monday. Yesterday was Sunday. If yesterday (Sunday) were to be tomorrow then today would be Saturday".
Did you get all that?
Well, wait until you hear what others had to say.
"In our system, tonight's midnight is the first moment of tomorrow. But as for the rest of us – there's no official answer and the military use a system in which midnight is 0 hours. In that system, tonight’s midnight is the first moment of tomorrow. But as for the rest of us – there’s no official answer.. Blah, blah, blah ..
And a few other off-the-grid ideas. Then, we have this to ponder ..
Yesterday, Today and Tomorrow went into a bar.
Yesterday: Be thankful my friends for if it were not for me how else would you have gotten here?
Today : Listen. If not for me, how are y'all going to enjoy this?
Tomorrow: Now, now, without me what do you two have to look forward to?
That in a nutshell tells us what life is really all about. When we think about it our lives can be summed up in three elements. Whatever it is we do at the present moment is archived instantly as memories of the past. Every dream, each aspiration, every plan all reside in every tomorrow that is yet to happen. Today is all we have to do anything because yesterday is gone forever and tomorrow is yet our best hope that our dreams may still come true.
However, let's be aware of the quote below:
We crucify ourselves between two thieves: regret for yesterday and fear of tomorrow. --- Fulton Oursler