For information, all Turnitin services and related websites (Turnitin, OriginalityCheck, GradeMark, PeerMark) may be unavailable for use during standard maintenance times scheduled by Turnitin (based in the US).
Times for these scheduled maintenance windows are the first and third Saturdays of each month, 7:00 AM to 11:00 AM Pacific Time. In the UK this is typically 2pm-6pm or 3pm-7pm, depending on the time of year.
These maintenance windows are not always used but we advise that you do not set submission deadlines for the first or third Saturday of the month.
When Turnitin notify us that maintenance is going to take place, we post this information on this Blog a.s.a.p. Turnitin also post this information in the Turnitin interface.