29 C.F.R. § 4043.7
Computation of time.
CFR 2003 annual edition (revised as of 2003-07-01) · in effect Jul 1, 1997 to Jul 1, 2004
In computing any period of time, the day of the event from which the period of time begins to run shall not be included. The last day so computed shall be included, unless it is a weekend or Federal holiday, in which case the period runs until the end of the next regular business day.