The reading おうじ (ōji) uses the On'yomi for both 往 (ō) and 時 (ji). 往 (ō) means 'past' or 'depart', and 時 (ji) means 'time'. It is distinct from とうじ (tōji - at that time) which uses 当. 往時 refers to old times or days gone by, indicating a past era or period.
往(オウ)時(ジ)のOn'yomiによる読みです。「当時(とうじ)」と混同しやすいので注意しましょう。過去の時代、過ぎ去った昔の時間を指す言葉です。
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