also: いくか
noun
how many days
Used to ask about a duration or number of days. Often appears in the phrase 幾日も meaning 'for many days'.
See also: 幾日も
ここに来てから幾日経ちましたか。
How many days have passed since you came here?
彼は幾日も家に帰
He didn't come home for many days.
noun
what day of the month
Asks for a specific date within a month. More formal or written than 何日 (なんにち), but still used.
今日は幾日ですか。
What is the date today?