with i as integer different format for an declared array

Writing updated values to a database from a listbox selection I am having problems with date formatting. Basically most of the textbox values are text and are needed as text the array below though are the textboxes that are actual date value. How can I add a condition to use a date format version for the numbers listed in the array

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I tried

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But that changes other required numbers that are needed

My Array = (10,21,24,27,29,31,33,35,37,39,41,43,45)