day of reckoning

noun

1. 1

   an unpleasant or disastrous destiny

   everyone was aware of the approaching doom but was helpless to avoid it

   that's unfortunate but it isn't the end of the world

2. 2

   (New Testament) day at the end of time following Armageddon when God will decree the fates of all individual humans according to the good and evil of their earthly lives