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会ったのはいつですか

when did you meet them

→ 会う
phrase Rare #32,596
when did you meet them A polite question asking when someone met a person. The person who met them and the person met are often understood from context; 初めて means “for the first time” and 最後に means “the last time.”
JA: 彼女に最後に会ったのはいつですか。
EN: When was the last time you saw her?

はじめて彼らに会ったのはいつですか。

When did you first meet them?

ケイティ・マーカムに最後に会ったのはいつですか？

When was the last time you saw Katie Markham?

— ミスティック・リバー (2003)

彼に初めて会ったのはいつですか？

When did you first meet him?

最後に会ったのはいつですか。

When was the last time you saw them?