What I'm Not Going to Be Hungry at Three O'Clock

In italy, you have fixed times. Lunch is kind of like one o'clock and dinner is any time from seven 30 onwards. But in england, people don't really care about these dates. For example, my mamma invited us to come round for dinner at three o'clock. And whe i what, three O'clock? I l be too hungry before. Its if anything, again, more than my wife. It's so strange for me.