DateTimeParser.parse_datetime

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

parse_datetime(string, opts \\ [])

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Specs

parse_datetime(String.t() | nil, parse_datetime_options()) ::
  {:ok, DateTime.t() | NaiveDateTime.t()} | {:error, String.t()}

Parse a %DateTime{} or %NaiveDateTime{} from a string.

Accepts options parse_datetime_options/0