If the date field is a DateTime object it is expected to be stored in the data source as such. Note that the specified format is used only for displaying the date in a format that is easier for the user to read it.
This approach provides great flexibility when working with dates. Especially when implementing manual logic or calculations. Moreover, when the date is stored as DateTime in the data source there is no need to parse the value entered by the user to determine what is the entered date.
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