That was then. This is now.

That was then. This is now.

The situation in the past was very different from how it is in the present; what was true before is not representative of how things are now. A: "There used to be a time when banks wouldn't hesitate to give you a mortgage, so long as you had a good job." B: "That was then. This is now. It's not as easy as that anymore." I understand the company made you certain promises when they first hired you. But that was then. This is now, and we just can't afford to pay for these benefits any longer.
See also: that, this
Farlex Dictionary of Idioms.
See also:
  • that was then, and this is now
  • true enough
  • hold true
  • there's many a true word spoken in jest
  • true to
  • true to (someone or something)
  • many a true word is spoken in jest
  • a man is judged by his deeds, not by his words
  • actions speak louder than words
  • true to (one's) colors