dev/core#123 Retrieve existing participant custom fields for import #12159
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Overview
The date fields are not converted from the import date format to the default date format and thus end up beeing imported with a date value of 0.
See https://lab.civicrm.org/dev/core/issues/123 for details.
Before
Notice errors present.
After
Notice errors not present.
Technical Details
As per comment from @eileenmcnaughton #9072 (comment) there is no need for the custom contact fields, so I've replaced it instead of using an array union.