How to not have missing tv episodes show up

[80srule 33]

Emby seems to have its dates wrong as many shows will show up as missing with past dates but when I go look they have not aired. So I wondered how to hide these missing episodes. 

[pwhodges 2012]

Emby knows nothing except the dates supplied by the metadata providers.  You can turn off the display of missing episodes in the library settings (advanced).

Paul