/// <summary>
/// usefull for comparing different periods of time.
/// Often the period of time is one year.
/// Modelers may model different years as scenarios.
/// </summary>
public static Series ShiftToYear(Series s, int year)
{
Series wySeries = s.Clone();
if (s.Count != 0)
{
int day = s[0].DateTime.Day;
int month = s[0].DateTime.Month;
DateTime t1;
if (day == 29 && month == 2 && !DateTime.IsLeapYear(year))
{
day = 28;
}
t1 = new DateTime(year, month, day);
TimeSpan ts = new TimeSpan(t1.Ticks - s[0].DateTime.Ticks);
if (s.TimeInterval == TimeInterval.Monthly)
{
int yearOffset = year - s[0].DateTime.Year;
for (int i = 0; i < s.Count; i++)
{
DateTime t = s[i].DateTime;
if (t.Month == 2 && t.Day == 29 && !DateTime.IsLeapYear(t.Year + yearOffset))
{
t = t.AddDays(-1);
}
DateTime newDate = new DateTime(t.Year + yearOffset, t.Month, t.Day);
wySeries.Add(newDate, s[i].Value, s[i].Flag);
}
}
else
{
wySeries = Math.Shift(s, ts);
}
// wySeries.Table.AcceptChanges();
Series.CopyAttributes(s, wySeries);
}
return(wySeries);
}
