Hi,
I have a couple of qeustions
1) Can you look at the field and field formatting and check if there could be something going on at the field level?
2) Are you using the date control to set date and time?
3) Is it changing the value when you hit Enter to apply the attribute change or Save Edits
4) Is it reproducible in Attribute table, Attribute pane, or both?
5) What type of datasource?
Thanks,
Jennifer