New answers tagged workflow-variable
Split your ISO date format with the help of Utility action in SharePoint designer 2013 Set that splited variable to dateTime of workflow variable. reference : Split ISO format Date link
Like Amal said you can just change how it appears in your form. I would suggest making custom forms to do this. You can find date formats here: Custom date formats. Unless I am misunderstanding what you are trying to do.
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