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    <p>I used the following code to also take in to account bank holidays:</p> <pre><code>public class WorkingDays { public List&lt;DateTime&gt; GetHolidays() { var client = new WebClient(); var json = client.DownloadString("https://www.gov.uk/bank-holidays.json"); var js = new JavaScriptSerializer(); var holidays = js.Deserialize &lt;Dictionary&lt;string, Holidays&gt;&gt;(json); return holidays["england-and-wales"].events.Select(d =&gt; d.date).ToList(); } public int GetWorkingDays(DateTime from, DateTime to) { var totalDays = 0; var holidays = GetHolidays(); for (var date = from.AddDays(1); date &lt;= to; date = date.AddDays(1)) { if (date.DayOfWeek != DayOfWeek.Saturday &amp;&amp; date.DayOfWeek != DayOfWeek.Sunday &amp;&amp; !holidays.Contains(date)) totalDays++; } return totalDays; } } public class Holidays { public string division { get; set; } public List&lt;Event&gt; events { get; set; } } public class Event { public DateTime date { get; set; } public string notes { get; set; } public string title { get; set; } } </code></pre> <p>And Unit Tests:</p> <pre><code>[TestClass] public class WorkingDays { [TestMethod] public void SameDayIsZero() { var service = new WorkingDays(); var from = new DateTime(2013, 8, 12); Assert.AreEqual(0, service.GetWorkingDays(from, from)); } [TestMethod] public void CalculateDaysInWorkingWeek() { var service = new WorkingDays(); var from = new DateTime(2013, 8, 12); var to = new DateTime(2013, 8, 16); Assert.AreEqual(4, service.GetWorkingDays(from, to), "Mon - Fri = 4"); Assert.AreEqual(1, service.GetWorkingDays(from, new DateTime(2013, 8, 13)), "Mon - Tues = 1"); } [TestMethod] public void NotIncludeWeekends() { var service = new WorkingDays(); var from = new DateTime(2013, 8, 9); var to = new DateTime(2013, 8, 16); Assert.AreEqual(5, service.GetWorkingDays(from, to), "Fri - Fri = 5"); Assert.AreEqual(2, service.GetWorkingDays(from, new DateTime(2013, 8, 13)), "Fri - Tues = 2"); Assert.AreEqual(1, service.GetWorkingDays(from, new DateTime(2013, 8, 12)), "Fri - Mon = 1"); } [TestMethod] public void AccountForHolidays() { var service = new WorkingDays(); var from = new DateTime(2013, 8, 23); Assert.AreEqual(0, service.GetWorkingDays(from, new DateTime(2013, 8, 26)), "Fri - Mon = 0"); Assert.AreEqual(1, service.GetWorkingDays(from, new DateTime(2013, 8, 27)), "Fri - Tues = 1"); } } </code></pre>
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