Bugfix: Corrected the conversion of nanoseconds to milliseconds in DateComponents

[fhasse95]

This PR corrects the conversion of nanoseconds to milliseconds within the DateComponents class.

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[marcprux]

Thanks. Do you need a new skip-foundation release with this in it?

[fhasse95]

Thanks. Do you need a new skip-foundation release with this in it?

Yes, that would be great :)

[marcprux]

I released 1.3.15