I found a Johann Konecny, 1802, in the town where my husband's Konecny relatives are from.http://actapublica.eu/matriky/brno/prohlizec/5398/?strana=72
The next step would be to find a marriage record in the same area that matches what you know. If it works, then Johann 1802 is probably your Jan Konecny. If not, it's back to looking.
Shall we place bets on whether there's a connection between our lines? :)