あの頃ころ

expression

in those days; back then; at that time

Refers to a past period, often with a nostalgic or reflective tone. Used as a noun-like phrase.

• あの頃ころは毎まい日にちが楽たのしかった。

  Back then, every day was fun.

• あの頃ころのことをよく思おもい出だす。

  I often remember those days.