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POConvert DateTime to Julian Date in C# (ToOADate Safe?)
 

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    <p>I need to convert from a standard <strong>Gregorian</strong> date to a <strong>Julian</strong> day number. </p> <p>I've seen nothing documented in C# to do this directly, but I have found many posts (while Googling) suggesting the use of <a href="http://msdn.microsoft.com/en-us/library/system.datetime.tooadate.aspx" rel="noreferrer">ToOADate</a>.</p> <p>The documentation on <a href="http://msdn.microsoft.com/en-us/library/system.datetime.tooadate.aspx" rel="noreferrer">ToOADate</a> does not suggest this as a valid conversion method for Julian dates. </p> <p>Can anyone clarify if this function will perform conversion accurately, or perhaps a more appropriate method to convert DateTime to a Julian formatted string.</p> <hr> <p><a href="http://forums.asp.net/p/1173999/1972455.aspx" rel="noreferrer">This</a> provides me with the expected number when validated against <a href="http://en.wikipedia.org/wiki/Julian_day" rel="noreferrer">Wikipedia's Julian Day page</a></p> <pre><code>public static long ConvertToJulian(DateTime Date) { int Month = Date.Month; int Day = Date.Day; int Year = Date.Year; if (Month &lt; 3) { Month = Month + 12; Year = Year - 1; } long JulianDay = Day + (153 * Month - 457) / 5 + 365 * Year + (Year / 4) - (Year / 100) + (Year / 400) + 1721119; return JulianDay; } </code></pre> <p>However, this is without an understanding of the magic numbers being used.</p> <p>Thanks</p> <hr> <p><strong>References:</strong></p> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/system.datetime.tooadate.aspx" rel="noreferrer">DateTime.ToOADate Method</a></li> </ul>
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