Is it possible to know when the corperation will publish their preliminary financial results

Is there anything like financial report calendar from which I could know when the corp will broadcast preliminary financial result?

 

Here's one that might help.
https://www.earningswhispers.com/

 

You can also Google for “(stock symbol) earnings date”.
Finviz screener also shows the list of upcoming earnings by date.

 

Sorry, What I want to know is preliminary financial report date instead of standard financial report date, any ideas?