public CompositeDuration(int years = 0, int months = 0, int weeks = 0, int days = 0, int hours = 0, int minutes = 0)
{
_ym = new YMDuration(years, months);
_wdhm = new WDHMDuration(weeks, days, hours, minutes);
}
public CompositeDuration(YMDuration ym, WDHMDuration wdhm)
: this()
{
_ym = ym;
_wdhm = wdhm;
}