There are many applications available on the Play Store to add stamps to the photos! But, the one which I preferred and would like to recommend you is 'Auto Stamper: Timestamp Camera App for Photos 2018'!
Link to download: https://play.google.com/store/apps/details?id=com.autostamper.datetimestampphoto
This app will help you to add 'Date, Time, Text, Location, and Logo' to the photos you capture. Hope it will help you! :)