The Function list for a Date column is date-specific. It allows you to decide the type of modification you want to do on date values.
There are three different ways to generate the date value for duplicated records:
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Modify date value: randomly selects the day, month or year to modify and puts a random value in place.
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Switch day month value: switches the day and month values. If the original day value is greater than 12, then the new month value will be ((N-1) mod 12) +1. For example: If the original day is equal to 13, then the new month is equal to 1.
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Replace by random date: generates a random date with day, month and year values.