luty

Luty is February. Its name was originally an adjective meaning cold, severe or fierce, and like an adjective it takes the genitive ending -ego, so a date reads lutego, not the noun-style ending of the other months: dnia trzeciego lutego, on the third of February.

Lutego is easy to recognize once you know it, but a hurried hand can make it look like lipca or listopada at a glance, so check the first letters. The Roman numeral for February is II.