When saving for October 01, 2017 at 12pm the event auto adjusts to October 02, 2017 at 12am. When saving for October 01, 2017 at 12am the event errors out as if the event date were formatted incorrectly.
Thanks Jane! This is an issue with daylight savings (that pops up twice a year or so!)- it looks like this nation is in Australia and they move on Oct 1 - https://www.safework.sa.gov.au/show_page.jsp?id=2675
I've pinged our team to see what we can do!