at that time; in those days; then
Refers to a past period already mentioned or understood from context. Often used in narrative or reminiscing.
See also: その頃
At that time I was still a child, so I didn't understand anything.
In those days, he worked late every day.
Rare kanji form using 此; not recommended for learners.
Compound of この (this) and 頃 (time, period). The kanji 頃 is used for approximate time.