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  1. PO
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    <p>Probably best to abstract this to a method to do any date/day combination:</p> <p>(Extension Method)</p> <pre><code>public static bool TryGetDayOfMonth(this DateTime instance, DayOfWeek dayOfWeek, int occurance, out DateTime dateOfMonth) { if (instance == null) { throw new ArgumentNullException("instance"); } if (occurance &lt;= 0 || occurance &gt; 5) { throw new ArgumentOutOfRangeException("occurance", "Occurance must be greater than zero and less than 6."); } bool result; dateOfMonth = new DateTime(); // Change to first day of the month DateTime dayOfMonth = instance.AddDays(1 - instance.Day); // Find first dayOfWeek of this month; if (dayOfMonth.DayOfWeek &gt; dayOfWeek) { dayOfMonth = dayOfMonth.AddDays(7 - (int)dayOfMonth.DayOfWeek + (int)dayOfWeek); } else { dayOfMonth = dayOfMonth.AddDays((int)dayOfWeek - (int)dayOfMonth.DayOfWeek); } // add 7 days per occurance dayOfMonth = dayOfMonth.AddDays(7 * (occurance - 1)); // make sure this occurance is within the original month result = dayOfMonth.Month == instance.Month; if (result) { dateOfMonth = dayOfMonth; } return result; } </code></pre> <p>Results:</p> <pre><code>DateTime myDate = new DateTime(2013, 1, 1) DateTime dateOfMonth; myDate.TryGetDayOfMonth(DayOfWeek.Sunday, 1, out dateOfMonth) // returns: true; dateOfMonth = Sunday, 1/6/2013 myDate.TryGetDayOfMonth(DayOfWeek.Sunday, 4, out dateOfMonth) // returns: true; dateOfMonth = Sunday, 1/27/2013 myDate.TryGetDayOfMonth(DayOfWeek.Sunday, 5, out dateOfMonth) // returns: false; myDate.TryGetDayOfMonth(DayOfWeek.Wednesday, 1, out dateOfMonth) // returns: true; dateOfMonth = Wednesday, 1/2/2013 myDate.TryGetDayOfMonth(DayOfWeek.Wednesday, 4, out dateOfMonth) // returns: true; dateOfMonth = Wednesday, 1/23/2013 myDate.TryGetDayOfMonth(DayOfWeek.Wednesday, 5, out dateOfMonth) // returns: true; dateOfMonth = Wednesday, 1/30/2013 // etc </code></pre>
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    1. POHow to find the 3rd Friday in a month with C#?
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    1. USErik Philips
    1. USErik Philips
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    1. COYou've got a bug. It should be as below. Otherwise I think it's the cleanest solution. // Change to first day of the month DateTime dayOfMonth = instance.AddDays(1 - instance.Day);
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      1. USBartosz Wójtowicz
    2. COThanks, updated the example.
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      1. USErik Philips
 

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