Whatsapp does not show the correct date. What should I do?
WhatsApp uses your phone's time and date. If it's reported incorrectly then there is something wrong with the date in your phone. You can access time and date from Menu > Settings > More(optional for Android 4.2+) Date & Time.
WatsApp uses the date & time as per the phone, and not the server. Just check if the date & time is correctly set in your phone. You can edit these from the More Settings of the phone settings under More Menu.
You have to correct the date on your Android and it will work correctly.