DatumDependentDuration represents durations whose length in milliseconds cannot be determined without knowing the datum point.
I don't know how many days in a year unless I know if it's a leap year or not.
I don't know how many days in a month unless I know the name of the month (and if it's a leap year if the month is February)
| Constructor and description | 
|---|
| DatumDependentDuration
                                (int years, int months, int days, int hours, int minutes, int seconds, int millis) | 
| Type | Name and description | 
|---|---|
| Date | getAgo() | 
| From | getFrom() | 
| int | getMonths() | 
| int | getYears() | 
| DatumDependentDuration | minus(DatumDependentDuration rhs) | 
| DatumDependentDuration | minus(Duration rhs) | 
| DatumDependentDuration | plus(DatumDependentDuration rhs) | 
| DatumDependentDuration | plus(TimeDatumDependentDuration rhs) | 
| DatumDependentDuration | plus(Duration rhs) | 
| DatumDependentDuration | plus(TimeDuration rhs) | 
| long | toMilliseconds()@see groovy.time.BaseDuration#toMilliseconds() | 
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