Calculate next occurrence of an event

CalculateNextOcurrence.linq

<Query Kind="Program" />

void Main()
{
	const int NumberOfDaysInAWeek = 7;
	var firstRun = new DateTime(2016, 3, 2, 3, 25, 30);
	var ocurrenceInterval = TimeSpan.FromDays(2 * NumberOfDaysInAWeek);
	var now = new DateTime(2016, 03, 07);
	var next = CalculateNextEventOccurrence(firstRun, now, ocurrenceInterval);
	next.Dump();
}

// Define other methods and classes here
private DateTime CalculateNextEventOccurrence(DateTime firstOcurrence, DateTime referenceValue, TimeSpan ocurrenceInterval)
{
	checked
	{
		var difference = referenceValue - firstOcurrence;
		var ocurrenceIntervalTicks = ocurrenceInterval.Ticks;
		var nextOcurrenceNumber = (long)Math.Ceiling((double)difference.Ticks/ocurrenceIntervalTicks);
		var nextOcurrence = firstOcurrence.AddTicks(ocurrenceIntervalTicks * nextOcurrenceNumber);
		return nextOcurrence;
	}
}