Thanks to Peter Cook, friend of Bottom Bunk Funk, the actual date of Ice Cube's infamous  "Good Day" (see video below) may have been found. Peter made contact with a renown ancient alien theorist known only as "Donavon" via an internet media that has been identified as "Tumblr". In this virtual world, Donovan shared fascinating empirical data suggesting Ice Cube's good day was in fact January 20th, 1992. Here is an excerpt from this thrilling scholarly endeavor.

CLUE 1:
“went to short dogs house,
they was watching Yo MTV
RAPS”
Yo MTV RAPS first aired:
Aug 6th 1988
CLUE 2:
Ice Cubes single “today was a good day” released on:
Feb 23 1993
CLUE 3:
”The Lakers beat the Super
Sonics”
Dates between Yo MTV Raps air date AUGUST 6 1988 and the release of the single FEBRUARY 23 1993 where the Lakers beat the Super Sonics:
Nov 11 1988    114-103
Nov 30 1988    110-106
Apr    4 1989    115-97
Apr  23 1989    121-117
Jan  17 1990    100-90
Feb  28 1990    112-107
Mar  25 1990    116-94
Apr  17  1990    102-101
Jan  18  1991    105-96
Mar  24  1991    113-96
Apr  21  1991    103-100
Jan  20  1992    116-110
CLUE 4:
Dates of those Laker wins over SuperSonics where it was a clear day with no Smog:
Nov 30 1988
Apr   4  1989
Jan 18  1991
Jan 20  1992
CLUE 5:
“Got a beep from Kim, and
she can fuck all night”
beepers weren’t adopted by mobile phone companies until the 1990s. Dates left where mobile beepers were availible to public:
Jan 18 1991
Jan 20 1992
CLUE 6:
Ice Cube starred in the film “Boyz in the hood” that released late Summer of 1991, but was being filmed mid-late 1990 early 1991 and Ice Cube was busy on set filming the movie Jan 18 1991 too busy to be lounging around the streets with no plans. Ladies and Gentlemen..

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

-Donovan