Thanks to some close reading of the lyrics in Ice Cube's "It Was a Good Day," we now know that when the rapper rapped about his perfect day, he was rapping about January 20, 1991. Rigorously following six hard-to-spot clues, Murk Avenue's Donovan Strain arrives at this conclusion:

The ONLY day where:
Yo MTV Raps was on air
It was a clear and smogless day
Beepers were commercially sold
Lakers beat the SuperSonics
and Ice Cube had no events to attend was…
          JANUARY 20 1992
      National Good Day Day

After reblogging the post, Cord Jefferson noted, "This is top-shelf blogging." Now you know.

And now you can relive that day that was 21 years and seven days ago: