We assume that dates in old date formats are fixed to 365 days per year.
daysPerMonth
float<MeasureProduct<MeasureInverse<month>, MeasureProduct<day, MeasureOne>>>
daysPerYear
float<MeasureProduct<MeasureInverse<year>, MeasureProduct<day, MeasureOne>>>
monthsPerYear
float<MeasureProduct<MeasureInverse<year>, MeasureProduct<month, MeasureOne>>>
oldDayToYear days
float<MeasureProduct<day, MeasureOne>>
float<MeasureProduct<year, MeasureOne>>
oldMonthToYear months
float<MeasureProduct<month, MeasureOne>>
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