Translation guide
Expresses a past time period, often nostalgically or to contrast with the present. Japanese uses various time expressions depending on formality and nuance.
In those days, I was a student.
Referring to a period in the past, often with a sense of 'back then'.
Neutral and common; means 'at that time' or 'in those days'. Used in both spoken and written Japanese.
In those days, I was a student.
Literally 'around that time'. Very common in conversation. Slightly more casual than 当時.
Often carries a nostalgic tone, like 'back in those days'. Common in reminiscing.
With topic marker は, explicitly contrasts with now. 'As for those days...'
In those days, there were no smartphones.
Used in formal writing, news, or historical accounts.
Expressing fond memories or a sentimental look back.
当時 is neutral and can be used in both formal and informal contexts. その頃 is more conversational and refers to a specific time previously mentioned. あの頃 carries a nostalgic, emotional tone and is often used when reminiscing about the past.
Avoid directly translating 'in those days' word-for-word. Phrases like 'それらの日々に' are unnatural. Use the time expressions above instead.
その頃は、毎日公園で遊んでいた。
In those days, I played in the park every day.
あの頃は、何もかもが新鮮だった。
In those days, everything felt new.
In those days, people lived in fear of war.
In those days, we used to swim in this river.