17 CFR 260.7a-4: a-4 Calculation of time.

Saturdays, Sundays and holidays shall be counted in computing the effective date of applications for qualification filed under section 307(a) of the Act. The twentieth day shall be deemed to begin at the expiration of nineteen periods of twenty-four hours each from 5:30 p.m., eastern standard time or eastern daylight-saving time, whichever is in effect at the principal office of the Commission on the date of filing.