[Mayank Kumar]

Time stamp is showing that is it is published 53 years ago
You can also check it here.

Please give the solution of it or possible reason for this error. I checked the published date it is correct.

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[Robin W]

ok, I cannot say why that is happening.

it could be a theme or plugin issue

Themes

As a test switch to a default theme such as twentytwenty, and see if this fixes.

Plugins

If that doesn’t work, also deactivate all plugins apart from bbpress and see if this fixes. if it does, re-enable one at a time to see which is causing the error.

If you cannot do this to your site (say because it is live) then use the ‘troubleshooting’ features of this plugin to let you test without affecting other users

Health Check & Troubleshooting

Then come back