Don’t ask me why my odd little mind ended up considering this, but the fact remains that in Italian the word ‘giorno’ – day, is a ‘male’ word, whereas the word for week – ‘settimana’ is female.
I’m sorry, but I don’t understand why this is the case.
Italian is one of those languages, that, unlike English, defines everything as being either male or female, from a grammatical point of view. Sometimes you can guess that a word will be either female or male, other times, as in the day/week thing, there appears to be no logical explanation or consistency.

Stop reading, start speaking
Stop translating in your head and start speaking Italian for real with the only audio course that prompt you to speak.
Oh well, English has its notoriously devious spelling that bears little relation to pronunciation and Italian likes to catch you out with its odd male and female nouns.
No language is perfect. And before anyone points this out, I know that German nouns defy any reasonable explanation, especially with regard to the neuter gender that is assigned to some words.
Curious, very curious.