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iso8601 

        # DateTime.iso8601

(from ruby core)
---
    DateTime.iso8601(string='-4712-01-01T00:00:00+00:00'[, start=Date::ITALY], limit: 128)  ->  datetime

---

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

    DateTime.iso8601('2001-02-03T04:05:06+07:00')
                              #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
    DateTime.iso8601('20010203T040506+0700')
                              #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
    DateTime.iso8601('2001-W05-6T04:05:06+07:00')
                              #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>

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)
---
    dt.iso8601([n=0])    ->  string
    dt.xmlschema([n=0])  ->  string

---

This method is equivalent to strftime('%FT%T%:z'). The optional argument
`n` is the number of digits for fractional seconds.

    DateTime.parse('2001-02-03T04:05:06.123456789+07:00').iso8601(9)
                              #=> "2001-02-03T04:05:06.123456789+07:00"

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