Oops, it doesn't look like 'code change day' is a national day..

Other days

bounce

Bounce Day
self care

Self Care Day
bonang

Bonang Day
hiv awareness

Hiv Awareness Day
frozen yogurt

Frozen Yogurt Day
ruby

Ruby Day
eat what you want

Eat What You Want Day
boba

Boba Day
book

Book Day
promposal

Promposal Day