Refers to the time frame that prices are effective for certain suppliers, from 6:00 p.m to 6:00 p.m the following day. This time for price changes differs from the standard 12:00 a.m. to 12:00 a.m. time change that most suppliers had used until the beginning of 2002. Prices are available to OPIS subscribers once the change is confirmed and shortly after the price change becomes effective, based upon local terminal times.