彼时

彼时	bǐ shí	at that time
彼	bǐ	that / those / (one) another
时	shí	old variant of 时
时	Shí	surname Shi
时	shí	(bound form) time; hour; period; season / (after a numeral) o'clock; hour(s) / (after a verb phrase or clause) when; while