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"use the alteryx DateTimeAdd(dt,i,u) function to add the number of days (42349) minus 2 to 1900-01-01 to get the correct date"
Because you have two types of dates in the field, it might be best to use a filter beforehand where length([Field1])=5. Then you can pass these values into the formula and convert the values from the false using a date time tool, and then union them back together.