The present (or here and now) is the time that is associated with the events perceived directly and in the first time, not as a recollection (perceived more than once) or a speculation (predicted, hypothesis, uncertain). It is a period of time between the past and the future, and can vary in meaning from being an instant to a day or longer. In radiocarbon dating, the "present" is defined as AD 1950.
We are always acting on what has just finished happening. It happened at least 1/30th of a second ago. We think we’re in the present, but we aren’t. The present we know is only a movie of the past.
Ken Kesey, As quoted by Tom Wolfe in The Electric Kool-Aid Acid Test (1968) Ch. 11.
Today is only one day in all the days that will ever be. But what will happen in all the other days that ever come can depend on what you do today. It's been that way all this year. It's been that way so many times. All of war is that way.