To hide Last Seen Time On WhatsApp, follow these steps.
Open whatsapp messenger from your smartphone and press option.
You would see setting options. Select settion and go to account option.
From account option, go to privacy setting.
Now you would see who can see my personal info option. From there, you can set last seen for everyone, your contacts only or nobody.
You can check complete tutorial on http://www.theandroidportal.com/hide-...
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