Many people don't like to be monitored and love to exit whatsapp without the "last seen on ...... " display telling their whatsapp contacts the last time they were online. You can actually remove it if you don't want it. Here's the simple steps on how to remove the last seen on.... from your whatsapp details.
STEP 1: Launch the whatsapp and go to settings
STEP 2: Select Privacy Settings
STEP 3: Change the options you have under last seen to "Nobody" then Save
If you've successfully done that, voila! you can now exit your whatsapp anytime without anybody knowing the last time you were active.
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