星期幾

星期几
xīngqījǐ
which day of the week

CEDICT

which day of the week (question)

Wiktionary

Examples

你星期幾學漢語？

Which day do you learn Chinese?

Source: Tatoeba

我不知道他星期幾會來。

I don't know what day he'll come.

Source: Tatoeba

Entry Composition

1 星期 xīngqī
  1. week
  2. day of the week
  3. Sunday

classifier: 個
2 幾 jǐ
  1. how much
  2. how many
  3. several
  4. a few