How to hide Last seen on Whatsapp

Last seen timestamp give us an idea about when the person,
whom you want to chat was online.
It is great feature but the feature comes out to be really very annoying
because it reveals whether you’re online and not.
You can’t hide yourself from your friends and they’ll keep on chatting with you.

So, if you want to hide this “last seen at” timestamp from your WhatsApp account
then download Not Last Seen app.
After installing, check the option to hide your ‘last seen at’ timestamp. [NO ROOT REQUIRED]