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POLINQ to SQL: there was an error in a part of the date format
 

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  1. POLINQ to SQL: there was an error in a part of the date format
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    <p>I have an application where I want to find the distinct available months that are available in a given year. However, with the query below I get the error message </p> <blockquote> <p>There was an error in a part of the date format. [ Expression (if known) = ]</p> </blockquote> <p>when I try to execute the following query:</p> <pre><code>IQueryable&lt;DateTime&gt; availableMonths = (from item in database.IntakeItems where item.Timestamp &gt;= statsYearStart &amp;&amp; item.Timestamp &lt;= statsYearEnd select new DateTime(1, item.Timestamp.Month, 1)) .Distinct() .OrderByDescending(y =&gt; y.Month); </code></pre> <p>The <code>statsYearStart</code> and <code>statsYearEnd</code> are created in a property-setter and contain valid DateTime when the query is executed:</p> <pre><code>statsYearEnd = new DateTime(value, 12, 31); statsYearStart = new DateTime(value, 1, 1); </code></pre> <p>The database is created via a code-first approach using EntityFramework. The column for item.Timestamp is defined as:</p> <pre><code>private DateTime timestamp; [Column] public DateTime Timestamp { get { return timestamp; } set { if (timestamp != value) { NotifyPropertyChanging(); timestamp = value; NotifyPropertyChanged(); } } } </code></pre> <p>I'm pretty new to LINQ and EF, so let me know if you need additional information. At first I suspected that this could be because of a localization issue (the Application), however I'm not using <code>.ToString</code> on any of the <code>DateTime</code>s. What might cause the exception?</p>
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