We would like to inform you that on 12 March (Tuesday) from 4:00 p.m. to 10:00 p.m. the USOS system and related systems such as USOSadm / APD/ USOS web/ PLANISTA will be unavailable due to maintenance work.
We apologise for all the inconvenience
Source: IT Centre, 91滴滴
Edit: Communications and PR Centre, 91滴滴