civicrm/civicrm-core — pull request #3710 by jmcclelland (2014-07-21 17:26:11+00:00)
Title: CRM-15019 - avoid validation error on register date if not using ISO

date format.

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* CRM-15019: Importing participant record with register date in a format other than YYYY-MM-DD results in validation error
https://issues.civicrm.org/jira/browse/CRM-15019