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"System.Customer.UserImportNewUserPasswordFormat" - Optional attribute.  A string that can be used to configure an Org's initial password.  Accepts all AlphaNumeric characters, special symbols and Profile index keys (e.g. LastName).  Can NOT use char '+' as that is used to parse the field.  Additionally, you can specify casing by making the key to be used all caps or lowercase.  If the Key not in all caps or lowercase, it will capitalize the first letter. Example Values: "LastName+123!" or "123+firstname+!!!+LASTNAME+321".  NOTE: As of 3.6.3 The base UserImporter now supports "DateOfBirth" in this field (value).  You must pass a valid DateTime format as a "predicate".  (E.g.  'DateOfBirth(dd-MMM-yyyy)' , 'DateOfBirth(dd-MMM-yyyy,dd-MM-yy)').   See 

DateOfBirth(pwd output date format,optional:input date format provided in CSV file): The first parameter specifies the format used to generate the initial user's password (output). The (optional) 2nd parameter can be used to specify the date format of the birth date in the CSV file. This is required if the date format in the CSV file is not in ISO standard. The input date format helps the user importer to parse the date correctly. For example, if the date format in the CSV file is 'dd-MM-yy', the automatic parsing mechanism would automatically assume a date format 'MM-dd-yy' and therefore would switch day and month because the server's operating system is set to format dd-MM-yy.
See System.Customer.UserImportUseRandomPasswordIfNotProvided for detailed behaviour in combination with other configuration options.

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