Sentence (plain past / だった) + っけ

[Was it...? (trying to recall)]

Connection: Sentence (plain past / だった) + っけ

Usage: Used when trying to remember or confirm something. Expresses uncertainty about a past event or fact. Casual, spoken form.

Examples:

明日の会議は何時だったっけ？(What time was tomorrow's meeting again?)

あの映画、もう見たっけ？(Did I already watch that movie?)

彼の名前、何だっけ？(What was his name again?)