public static DateTime PreviousBusinessDay(DateTime date, Holiday.Calendar cal)
{
// if date is NOT a trade day, then adding 0 trade days will return the previous trade day, otherwise we add -1 trade days
int daysBack = Holiday.IsTradeDate(date, cal) ? -1 : 0;
return Holiday.AddTradeDays(date, daysBack, cal);
}
public static DateTime LastBusinessDayOfMonth(int month, int year, Holiday.Calendar cal)
{
var firstDayOfNextMonth = new DateTime(year, month, 1).AddMonths(1);
var lastDay = firstDayOfNextMonth.AddDays(-1);
return Holiday.DateAdd(Holiday.StepInterval.Day, 0, lastDay, Holiday.Direction.backward, cal);
}