Pastable version of Showing several datetimes (event/concert style)

<pre class='prettyprint' language='cs'>private string GetDateString(List&lt;DateTime&gt; dates)
        {
            StringBuilder sb = new StringBuilder();

if (dates.Count == 1)
            {
                sb.Append(string.Format(CultureInfo.InvariantCulture, &quot;{0:MMM} &quot;, dates[0]));
                sb.Append(string.Format(CultureInfo.InvariantCulture, &quot;{0}{1} {2:HH:mm}&quot;, dates[0].Day, GetYearString(dates[0]), dates[0]));

return sb.ToString();
            }

dates.Sort();

for (int i = 0; i &lt;= dates.Count - 1; i++)
            {
                if (i == 0)
                {
                    sb.Append(string.Format(CultureInfo.InvariantCulture, &quot;{0:MMM} &quot;, dates[0]));
                    sb.Append(string.Format(CultureInfo.InvariantCulture, &quot;{0}&quot;, dates[0].Day));

if (i &lt; dates.Count - 1)
                    {
                        if (dates[i + 1].DayOfYear != dates[i].DayOfYear + 1)
                        {
                            sb.Append(string.Format(CultureInfo.InvariantCulture, &quot;{0} {1:HH:mm}, &quot;, GetYearString(dates[i]), dates[i]));
                        }
                    }

continue;
                }
                else if (i == 1 &amp;&amp; dates[i].DayOfYear - 1 == dates[i - 1].DayOfYear)
                {
                }
                else
                {
                    sb.Append(string.Format(CultureInfo.InvariantCulture, &quot;{0:MMM} &quot;, dates[i]));
                }

if (i &lt; dates.Count - 1)
                {
                    if ((dates[i].DayOfYear + 1) != dates[i + 1].DayOfYear &amp;&amp;
                        dates[i].Month == dates[i + 1].Month &amp;&amp;
                        dates[i].Year == dates[i + 1].Year &amp;&amp;
                        dates[i].TimeOfDay == dates[i + 1].TimeOfDay)
                    {
                        if (i &gt; 1)
                        {
                            sb.Append(string.Format(CultureInfo.InvariantCulture, &quot;{0}{1} {2:HH:mm}, &quot;, dates[i].Day, GetYearString(dates[i]), dates[i]));
                        }

continue;
                    }
                }

bool stepDates = true;

if (i != dates.Count - 1)
                {
                    while (dates[i].DayOfYear + 1 == (dates[i + 1].DayOfYear) &amp;&amp;
                        dates[i].TimeOfDay == dates[i + 1].TimeOfDay &amp;&amp;
                        dates[i].Month == dates[i + 1].Month &amp;&amp;
                        dates[i].Year == dates[i + 1].Year)
                    {
                        if (stepDates)
                        {
                            if (i &gt; 1)
                            {
                                sb.Append(string.Format(CultureInfo.InvariantCulture, &quot;{0}&quot;, dates[i].Day));
                            }

stepDates = false;

sb.Append(&quot;-&quot;);
                        }

i++;

if ((i == dates.Count - 1) ||
                            (dates[i].DayOfYear + 1 != dates[i + 1].DayOfYear &amp;&amp;
                            dates[i].Year == dates[i + 1].Year))
                        {
                            break;
                        }
                    }
                }

sb.Append(string.Format(CultureInfo.InvariantCulture, &quot;{0}{1} {2:HH:mm}, &quot;, dates[i].Day, GetYearString(dates[i]), dates[i]));
            }

return sb.ToString().Substring(0, sb.Length - 2);
        }

private string GetYearString(DateTime inputDate)
        {
            if (inputDate.Year != DateTime.Now.Year)
            {
                return string.Format(&quot; {0}&quot;, inputDate.Year);
            }

return string.Empty;
        }</pre>
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Pastable version of Showing several datetimes (event/concert style)