How can I convert a string field formatted as 2017/09/08 00:00:00:00
to a date type that reads 09/08/2017?
As you mentioned, DTStoDate{yourStringhere}
is the in-house solution.
Otherwise, filter out the blank time data by taking only the 10 leftmost characters of that string. Then cast it: DateValue(Left({yourStringhere},10))