remember this [british trick];
"thirty days hath september, spril, june and november. all the rest have thirty-one except february alone, which has twenty-eight days in a year and twenty-nine in a leap year."
same
for a long time in my childhood i actually thought there were multiple months that had 29 days (i.e. months could have 29, 30, or 31 days, with February being the odd one out having 28 days normally and 29 on leap year) lmao