'In that Day' in the Bible

Then will mine anger kindle upon them in that day, and I will forsake them and will hide my face from them and they shall be consumed, and many calamities and misfortunes shall find them out, - and they will say, in that day, Is it not because my God is not in my midst, that these calamities have found me out?

But, I, will utterly, hide, my face, in that day, because of all the wickedness which they have done, in that they have turned away unto other gods.