Don't like to display that last seen time to the another person, just
want to stay hidden, well earlier it was not possible and we use to use
some 3rd party apps, well now it can done officially.
- Open WhatsApp application on your device.
- Navigate to Settings > Chat Settings > Advanced > Last Seen Timestamp.
- It will be one just disable it and that's it now no one can see your last seen timestamp. So its officially disabled.
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