Fix specs

[ronaldtse]

Most of the specs are failing due to the ISO 8601 string differences:

                diff from    : LAST-CHANGE="2012-04-06T23:51:37+00:00"
                diff to      : LAST-CHANGE="2012-04-07T01:51:37.112+02:00"

• "diff from" is the text generated by this library, it uses the lutaml-model date-time datatype, which produces the string "2012-04-06T23:51:37+00:00".
• "diff to" is the original text in the XML, it uses a format that contains a decimal point with additional 3 decimal digits, plus it has the timezone properly set: "2012-04-07T01:51:37.112+02:00"

I believe this is something that needs to be fixed in lutaml-model, where the date-time that is read needs to retain its original time offset (+02:00) and the original precision.

[ronaldtse]

Depends on:

• https://github.com/lutaml/lutaml-model/issues/156

[ronaldtse]

This will be fixed by using the new mechanism at lutaml-model for high-precision date time using custom date types.