The referral date is the date that the referral was made by the referrer
Referral date must be supplied in standard ISO date in the format YYYY-MM-DDZ where 'Z' represents a universal time zone. If a time is also required then this will be universal for example YYYY-MM-DDThh:mm:ssZ.
Tag within the XML is: <referralDate>2013-09-23T09:37:21.49Z</referralDate>
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