I have no doubt there are quite many couples who have their own life during the day and can meet only in the evening. This is what usually happens to me and my girlfriend. I spend my day at work, she spends her day at University and we meet up at the dinner table. Of course, quite often we start sharing experiences of our day: what happened, what we liked, what we disliked.
And I have a perfect way of answering “so, how was your day today?”, unbeatable sweet thing to say to your girlfriend. Just start your answer with: today, when I woke up, first thing I thought about was you.