DateTimeParser.parse_date

You're seeing just the function parse_date, go back to DateTimeParser module for more information.
Link to this function

parse_date(string, opts \\ [])

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Specs

parse_date(String.t() | nil, parse_date_options()) ::
  {:ok, Date.t()} | {:error, String.t()}

Parse %Date{} from a string.

Accepts options parse_date_options/0