昭和 しょうわ元禄 げんろくじゃなかったです
shōwagenrokujanakattadesu

Noun
Desu Copula

The polite, past negative form of 昭和元禄

1. Wasn't Showa or Edo period.; Wasn't the Showa or Edo era.

Past/Perfective
Negative
Polite
Casual Register