What is the maximum value for a Date/Time field?
- The Date Time picker maximum value is '2899-12-31 23:59:59'.
- Due to a limitation within the UI itself, it is only possible to scroll through by single months.
- Currently there is no way to enter the value manually.
There are a number of Enhancement Requests in place to make the DateTime picker more user-friendly in terms of being able to manually enter the month and year.
There is no timeframe for when such an enhancement will be included in a future release.