1.
at that time, in those days
Refers to a specific period in the past that has been mentioned or is understood from context.
当時 refers to a specific period in the past that has already been mentioned or is understood from context. It always looks back to a defined time, not the general past.
COMMON PATTERNS:
- 当時の + noun: ~ of that time (当時の写真, 当時の日本)
- 当時は: at that time (topic marker)
- 当時から: since that time
SIMILAR WORDS:
- その頃/その時: at that time (conversational)
- あの頃: in those days (nostalgic nuance)
- 当時: at that time (neutral to formal, often used in writing and narration)
REGISTER:
Neutral to slightly formal. Common in written narratives, news articles, and historical accounts. In casual conversation, その頃 or あの時 is more natural.