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eventDate (http://rs.tdwg.org/dwc/terms/eventDate)

@return [String]
Relevant temporal context for the distribution record. Preferably given as
a year range or single year on which the distribution record is valid. For
the same area and taxon there could therefore be several records with
different temporal context, e.g. in 5 year intervals for invasive species.

Example: "1930"; "1939-1945"
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