How to distinguish between fields with similar values and no labels?

I have two date fields next to each other on a form in my app.

I am not using labels for any of the fields. Rather I have put a help text inside each of them. When the user taps on a field, native keyboard opens and once he enters the first character the help text disappears.

My issue is that while most of the other fields are easily distinguishable (Like full name, country, address etc.), the two date fields, once filled up, looks too similar as they stand for start date and end date.

Please suggest a way to distinguish these two fields after it is populated. I can't put a label outside the field because it will look like the odd ones out.