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POLoad users by birthday
 

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    <p>I want to know is there a better/easier way to load users by birthday.</p> <p>I have a User instance, which has properties, including this one: </p> <p><code>public DateTime? BirthDate { get; set; }</code></p> <p>What I want to do is to load that users who has bdays from one date to another:</p> <pre><code>public IEnumerable&lt;User&gt; LoadUsersByBirthday(DateTime from, DateTime into) </code></pre> <p>I don't care about birthday year, for example, if I have 3 users with birthdays:</p> <ol> <li>DateTime(1991, 3, 20); </li> <li>DateTime(1990, 4, 25);</li> <li>DateTime(1989, 3, 10);</li> </ol> <p><code>LoadUsersByBirthday(new DateTime(2990, 3, 1), new DateTime(3013, 4, 15))</code> should return 2 users - 1st and 3rd.</p> <p>My method looks like this:</p> <pre><code>public IEnumerable&lt;User&gt; LoadUsersByBirthday(DateTime from, DateTime into) { var days = DateTime.DaysInMonth(from.Year, from.Month); var u1 = _unit.User.Load(u =&gt; ((DateTime) (u.BirthDate)).Month == from.Month &amp;&amp; ((DateTime) (u.BirthDate)).Day &gt;= from.Day &amp;&amp; ((DateTime) (u.BirthDate)).Day &lt;= days); var u2 = _unit.User.Load(u =&gt; ((DateTime) (u.BirthDate)).Month &gt; from.Month &amp;&amp; ((DateTime) (u.BirthDate)).Month &lt; into.Month); var u3 = _unit.User.Load(u =&gt; ((DateTime) (u.BirthDate)).Month == into.Month &amp;&amp; ((DateTime) (u.BirthDate)).Day &lt;= into.Day); return u1.Concat(u2).Concat(u3); } </code></pre> <p>It works, but is there a better/easier way to do this?</p>
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    1. USAdel Khayata
    1. USArt713
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    1. COActually, I don't think that will work for people born on Feb 29th if the target year isn't a leap year...
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      1. USMatthew Watson
    2. COIf you do not care about the year, either do not use `DateTime` (which *does* care about the year), or create `DateTime` values with one uniform dummy year before comparing.
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      1. USO. R. Mapper
    3. COWhat should happen if the month of `from > into`? E.g. `LoadUsersByBirthday(new DateTime(2990, 12, 1), new DateTime(3013, 1, 15))`?
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      1. USTorbjörn Kalin
 

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