Using durations
Calendar

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Creating a duration object:
years ( x -- duration )

months ( x -- duration )

weeks ( x -- duration )

days ( x -- duration )

hours ( x -- duration )

minutes ( x -- duration )

seconds ( x -- duration )

milliseconds ( x -- duration )

microseconds ( x -- duration )

nanoseconds ( x -- duration )

instant ( -- duration )


Converting a duration to a number:
duration>years ( duration -- x )

duration>months ( duration -- x )

duration>days ( duration -- x )

duration>hours ( duration -- x )

duration>minutes ( duration -- x )

duration>seconds ( duration -- x )

duration>milliseconds ( duration -- x )

duration>microseconds ( duration -- x )

duration>nanoseconds ( duration -- x )