How can you ask your girlfriend the time sign?

It's best to ask directly, but sometimes if you ask a girl directly, she won't necessarily tell you, but it will arouse her disgust! In that case, why not just ask and do something, such as borrowing her ID card, or joking that you are a few days older than me? Wait, as long as you know the date of her solar calendar, you can go to Baidu and ask a question to know the date of her lunar calendar. It's a little troublesome, but it's better than not saying hello.