MISSING_COLLECTION_DATE - AtlasOfLivingAustralia/ala-dataquality Wiki
No eventDate has been given for the occurrence.
Implications and caveats
This means there is no event information for the record (year, month, day or time) and the ALA can't place the occurrence in time.
Where an incomplete or ambiguous date has been given RECORDED_DATE_INVALID is used instead.
Data custodian recommendations
Review date information and supply if known.