300.11—Day; business day; school day.
(b)
Business day means Monday through Friday, except for Federal and State holidays (unless holidays are specifically included in the designation of business day, as in § 300.148(d)(1)(ii) ).
(c)
(1)
School day means any day, including a partial day that children are in attendance at school for instructional purposes.
(2)
School day has the same meaning for all children in school, including children with and without disabilities.