How can I modify the week day format in the React datetime library from Su Mo to Sun, Mon?

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You can modify the week day format in the React datetime library by using the "weekdayFormat" prop in the component. Here's an example of how to modify the week day format from "Su Mo" to "Sun, Mon":

<DateTimePicker 
  ...
  weekdayFormat="ddd" 
/>

The "weekdayFormat" prop accepts a string value that represents the format of the week day. In this case, "ddd" represents the short name of the week day (e.g. "Sun", "Mon").

You can also use other formatting options such as "dddd" for the full name of the week day (e.g. "Sunday", "Monday").