To add one change to Tim’s answer, I think you’ll need the letter a at the end of the second argument (which denotes AM/PM), so it would look like this: parseDateTime($Iteratorchemistry_content_1/uc_WorkflowDate,'mm/d/yyyy hh:mm:ss a',empty) Without the a, the parse function won’t know if a the time in your example is 8 in the morning or 8 in the evening. You can also omit the third argument (empty) for brevity.
One more link that documents all possible date formatting characters: https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html
You should use /d/ instead of -dd-. This is the correct one: parseDateTime($Iteratorchemistry_content_1/uc_WorkflowDate,'mm/d/yyyy hh:mm:ss',empty)
See https://docs.mendix.com/refguide/parse-and-format-date-function-calls for the description
See https://mydemoversion8-sandbox.mxapps.io/p/ff/ParseDateTime for experimenting with formats