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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xml:id="function.jewishtojd" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>JewishToJD</refname>
<refpurpose>Converts a date in the Jewish Calendar to Julian Day Count</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>jewishtojd</methodname>
<methodparam><type>int</type><parameter>month</parameter></methodparam>
<methodparam><type>int</type><parameter>day</parameter></methodparam>
<methodparam><type>int</type><parameter>year</parameter></methodparam>
</methodsynopsis>
<para>
Although this function can handle dates all the way back to the year 1
(3761 B.C.), such use may not be meaningful. The Jewish calendar has
been in use for several thousand years, but in the early days there was
no formula to determine the start of a month. A new month was started
when the new moon was first observed.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>month</parameter></term>
<listitem>
<para>
The month as a number from 1 to 13
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>day</parameter></term>
<listitem>
<para>
The day as a number from 1 to 30
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>year</parameter></term>
<listitem>
<para>
The year as a number between 1 and 9999
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
The julian day for the given jewish date as an integer.
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>jdtojewish</function></member>
<member><function>cal_to_jd</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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