Haircut during the three weeks

Can you get a haircut during the 3 weeks - but not during the 9 days?

Ashkenazi custom is to refrain from taking a haircut for three weeks. Sephardim just do the week of Tisha Be’av, which is one day this year.

Shalom. Why is shavua shechal bo only one day this year? Tisha b’av is Shabbat. Todah.

It goes by the actual day where we fast.