Hi all,
As discussed, this is related to the change from Daylight to Standard time. Survey123 stores dates as occuring in midnight in the timezone the device occurs. Times are stored in ArcGIS Online as UTC times; browsers automatically convert the time to the UTC offset. Given the change to Standard time, the UTC offset of the browser shifted by one hour, causing the local midnight to become 11:00pm the previous day when viewed now. Conversely, dates recorded in Standard time and viewed while Daylight Savings while display 1:00 am instead of midnight.