counting print jobs, five minutes at a time (pseudo-C#)

FiveMinuteChunks.cs

DateTime start = new DateTime(2015, 1, 13, 0, 0, 0);
DateTime end = start.AddDays(1);

List<PrintJob> jobs = GetPrintJobsOnDay(start);
List<JobStatisticsEntry> statsEntries = new List<JobStatisticsEntry>();
jobs.Sort(j => j.DateTimePerformed);
int jobIndex = 0;

// for each five-minute chunk of this day
for (DateTime partStart = start; partStart < end; partStart = partStart.AddMinutes(5))
{
    DateTime partEnd = partStart.AddMinutes(5);
    int jobCount = 0;
    
    while (jobs[jobIndex].DateTimePerformed >= partStart && jobs[jobIndex].DateTimePerformed < partEnd)
    {
        // the current job was performed within this five-minute chunk
        ++jobCount;
        
        // test the next job
        ++jobIndex;
    }

    // since the jobs are sorted by date/time, there is no other job in the list within this five-minute chunk

    // store it
    var statsEntry = new JobStatisticsEntry(partStart, jobCount);
    statsEntries.Add(statsEntry);

    // continue to the next five-minute chunk
}