private static IEnumerable <DateTime> GetOccurrences(DateInterval interval, DatePeriod period, Calendar calendar,
DateTime start, DateTime end, bool skipWeekends = true)
{
var difference = DateSpan.GetDifference(interval, start, end) / period.Quantifier;
if (start.Kind == DateTimeKind.Utc)
{
start = start.ToLocalTime();
}
for (var i = 0; i < difference; i++)
{
switch (period.Frequency)
{
case DatePeriodFrequency.Seconds:
var seconds = calendar.AddSeconds(start, period.Quantifier * i);
yield return(DeferOccurrenceFallingOnWeekend(calendar, seconds, skipWeekends));
break;
case DatePeriodFrequency.Minutes:
var minutes = calendar.AddMinutes(start, period.Quantifier * i);
yield return(DeferOccurrenceFallingOnWeekend(calendar, minutes, skipWeekends));
break;
case DatePeriodFrequency.Hours:
var hours = calendar.AddHours(start, period.Quantifier * i);
yield return(DeferOccurrenceFallingOnWeekend(calendar, hours, skipWeekends));
break;
case DatePeriodFrequency.Days:
var days = calendar.AddDays(start, period.Quantifier * i);
yield return(DeferOccurrenceFallingOnWeekend(calendar, days, skipWeekends));
break;
case DatePeriodFrequency.Weeks:
var weeks = calendar.AddWeeks(start, period.Quantifier * i);
yield return(DeferOccurrenceFallingOnWeekend(calendar, weeks, skipWeekends));
break;
case DatePeriodFrequency.Months:
var months = calendar.AddMonths(start, period.Quantifier * i);
yield return(DeferOccurrenceFallingOnWeekend(calendar, months, skipWeekends));
break;
case DatePeriodFrequency.Years:
var years = calendar.AddYears(start, period.Quantifier * i);
yield return(DeferOccurrenceFallingOnWeekend(calendar, years, skipWeekends));
break;
default:
throw new ArgumentException("Frequency");
}
}
}
private static IEnumerable <DateTimeOffset> GetOccurrences(DateInterval interval, DatePeriod period,
Calendar calendar, DateTimeOffset start, DateTimeOffset end, bool skipWeekends = true)
{
return(GetOccurrences(interval, period, calendar, start.DateTime, end.DateTime, skipWeekends)
.Select(occurrence => (DateTimeOffset)occurrence));
}