1. 清算之时;报应到来的日子
If someone talks about the day of reckoning, they mean a day or time in the future when people will be forced to deal with an unpleasant situation which they have avoided until now.

1. an unpleasant or disastrous destiny

e.g. 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

Synonym: doomdoomsdayend of the world

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

Synonym: Judgment DayJudgement DayDay of JudgmentDay of JudgementDoomsdayLast JudgmentLast JudgementLast Dayeschatondoomsdaycrack of doomend of the world