Hello How might I convert imported text like: Fri, 12/6/2019 to Fri, 12/13/2019 to show up in a “start date” and “end date” fields

Hello and thank you in advance if you can help with this. The rate chart example we use below, I would like to be able to pick filed cat1, cat2, cat3, etc and then another field zone1, zone2, zone3, etc in another field enter the miles and hav...