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iso8601 

        # Date.iso8601

(from ruby core)
---
    Date.iso8601(string='-4712-01-01'[, start=Date::ITALY], limit: 128)  ->  date

---

Creates a new Date object by parsing from a string according to some
typical ISO 8601 formats.

    Date.iso8601('2001-02-03')        #=> #<Date: 2001-02-03 ...>
    Date.iso8601('20010203')          #=> #<Date: 2001-02-03 ...>
    Date.iso8601('2001-W05-6')        #=> #<Date: 2001-02-03 ...>

Raise an ArgumentError when the string length is longer than *limit*.
You can stop this check by passing `limit: nil`, but note that it may
take a long time to parse.


(from ruby core)
---
    d.iso8601    ->  string
    d.xmlschema  ->  string

---

This method is equivalent to strftime('%F').

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