“It was day before yesterday” or “It was THE day before yesterday”?

Question

Are both following options are correct? If not, Which of the options is correct?

Option A: "It was day before yesterday"

Option B: "It was THE day before yesterday"?

The same question for

Option A: "It will be day after tomorrow"

Option B: "It will be THE day after tomorrow"

I always used option A till today when I saw the following slide, which mention option B and caused me this doubt.

SovereignSun · Accepted Answer · 2017-11-20 12:22:22Z

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You should use the definite article since you refer to the specific day (one before yesterday/one after tomorrow).

answered Nov 20 '17 at 4:07

SovereignSun

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The phrase “on a day before yesterday” is an awkward construct that is best avoided. Yesterday is too specific for the indefinite article. Something like “on a summer day” or “on a day in November” would be fine. – J.R.♦ Nov 20 '17 at 8:58
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@Soverign - I hope you’ll fix your answer, then, before it starts collecting downvotes. – J.R.♦ Nov 20 '17 at 9:02
However, I often hear, "On a day before today..." – SovereignSun Nov 20 '17 at 12:23
What does "on a day before today" mean? Does it mean any day before yesterday"? Well, you might as well say, "two days ago", or "nearly a week ago". Please cite English native speakers' usage of ...on a day before yesterday.... – Mari-Lou A Nov 20 '17 at 16:02
@Mari-LouA That actually means "on some unspecific day before today and not today", quite easy. "on a day before yesterday" means "on some unspecific day before yesterday and not yesterday" – SovereignSun Nov 20 '17 at 16:05

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