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<title>Converts a Julian Calendar date to Julian Day Count</title>
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<h1 class="refname">JulianToJD</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">JulianToJD</span> — <span class="dc-title">Converts a Julian Calendar date to Julian Day Count</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.juliantojd-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>juliantojd</strong></span>
( <span class="methodparam"><span class="type">int</span> <code class="parameter">$month</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$day</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$year</code></span>
)</div>
<p class="para rdfs-comment">
Valid Range for Julian Calendar 4713 B.C. to 9999 A.D.
</p>
<p class="para">
Although this function can handle dates all the way back to 4713
B.C., such use may not be meaningful. The calendar was created in
46 B.C., but the details did not stabilize until at least 8 A.D.,
and perhaps as late at the 4th century. Also, the beginning of a
year varied from one culture to another - not all accepted
January as the first month.
</p>
<div class="caution"><strong class="caution">Caution</strong>
<p class="para">
Remember, the current calendar system being used worldwide is the
Gregorian calendar. <span class="function"><a href="function.gregoriantojd.html" class="function">gregoriantojd()</a></span> can be used to
convert such dates to their Julian Day count.
</p>
</div>
</div>
<div class="refsect1 parameters" id="refsect1-function.juliantojd-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">month</code></em></span>
<dd>
<p class="para">
The month as a number from 1 (for January) to 12 (for December)
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">day</code></em></span>
<dd>
<p class="para">
The day as a number from 1 to 31
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">year</code></em></span>
<dd>
<p class="para">
The year as a number between -4713 and 9999
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.juliantojd-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
The julian day for the given julian date as an integer.
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.juliantojd-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.jdtojulian.html" class="function" rel="rdfs-seeAlso">jdtojulian()</a> - Converts a Julian Day Count to a Julian Calendar Date</span></li>
<li class="member"> <span class="function"><a href="function.cal-to-jd.html" class="function" rel="rdfs-seeAlso">cal_to_jd()</a> - Converts from a supported calendar to Julian Day Count</span></li>
</ul>
</p>
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