Couple things:
1. It's fucking gorgeous outside.
2. It's Friday.

That alone makes it a good day. But combing through my brain-soupifying Tumblr dashboard, I found that one brave soul, skater Donovan Strain, on his Tumblr MURK AVENUE, who, using O'Shea's own lyrics, had identified exactly when he'd had such a good 24*.
Behold:

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

If only we'd known a week ago!

*yeah, it could all be bullshit, but I'm not checking his work, fuck you.