Hi @文源, welcome to our forum!
Your question has been translated to English as this is an International forum, please post any replies in English and it will be easier for me and other users to assist you.
There is no setting in the camera application that will add a the date and time on the photo, but you can always check in the Album application when the photo was taken. To do that, follow the instructions below.
Open up the Album application > tap the photo > tap it once more and you will have 3 dots in the top right corner > tap them and choose "Details". This will display the data and time (you can also edit it after tapping the little pencil).
I hope that answers your question!
