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That will be the day vs Those were the days

that will be the day

1. that will be a great day worth waiting for:

  • That will be the day when every class is a place where every child has consistent, quality instruction.

2. (ironic) that’s very unlikely (is used to express doubt following some boast or claim by a person):

  • “He says he’ll do the washing-up.” “That’ll be the day!”

those were the daysis used as an expression of nostalgia for a happier time past:

  • Well, those were the days. It was a great time for jazz in Chicago.