Oops, it doesn't look like 'cranky hater of day' is a national day..

Other days

pumpkin

Pumpkin Day
latina equal pay

Latina Equal Pay Day
gum

Gum Day
martini

Martini Day
bow tie

Bow Tie Day
believe

Believe Day
donate your hair

Donate Your Hair Day
slime

Slime Day
youth

Youth Day
hoodie

Hoodie Day