public bool Contains(YmdString ymdString)
{
var dt = ymdString.ToDateTime();
if (dt == null)
{
return(false);
}
return(dt.Value.Year == Year &&
dt.Value.Month == Month);
}
public static YearMonth FromYmdString(YmdString ymdString)
{
var dateTime = ymdString.ToDateTime().Value;
return(new YearMonth(dateTime.Year, dateTime.Month));
}