What does Unknown earning date mean?

[KGMK]

Hello,

Sometimes when I look for earning persons it will say ‘Before market open’ and ‘Before market close’. Sometimes it will say Unknown.

What does this mean? Is the date found somewhere at SEC website?

[Mondeoman]

@KGMK

when I look for earning persons it will say ‘Before market open’ and ‘Before market close’. Sometimes it will say Unknown.

I do not understand the question. Can you try to be more specific about the context of “earning persons”?