gone were those days...is it correct

Yes, you can say it that way if you want to put special emphasis on 'gone'. You should not use this format all the time. Save it for "special occasions".

thanks...yeah.. gone are those days n gone were these days - both can be used rite..

I probably would not use 'these' to refer to days gone by. However, you can say 'Gone are the days...'

Gone are the days when cell phones were used only for talking.

Justdoitthanks...yeah.. gone are those days n gone were these days - both can be used rite..

Gone are the days when things were cheap.

The verb 'are' is used because the days when things were cheap are gone.

Hi Amy

It is coincidental. My sentence is similar to yours.

Gone were the days when intellectuals of all ism were engaged in debates without any fear