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schlagelk
Checklist
Motivation and Context
Milliseconds do not to really seem be supported in any of the date formatting or NSCalendar APIs. Because of that, there is issue #19.
Description
This PR adds a fractional seconds calculation to TimeInterval and a string formatter to DateComponentsFormatter that will append any available fractional seconds as milliseconds (it also adds a localizable string for "milliseconds"). This PR includes s a unit test to verify said code.