Gets the amount of years of this period.
!(p)
This returns the years unit.
!(p)
The months unit is not automatically normalized with the years unit.
This means that a period of "15 months" is different to a period
of "1 year and 3 months".
@return the amount of years of this period, may be negative
Gets the amount of years of this period. !(p) This returns the years unit. !(p) The months unit is not automatically normalized with the years unit. This means that a period of "15 months" is different to a period of "1 year and 3 months".
@return the amount of years of this period, may be negative