I tried to Install WhatsApp on my Samsung A30 and I got a response that the WhatsApp is out of date and am seeing a future date.
Have checked my phone date several times and everything is correct.
Perhaps delete this from your phone and rhen from the myapps section in your Playstore and try again.
🌈 Stay Safe 🌈
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.