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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.jdtounix" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>jdtounix</refname>
<refpurpose>Convert Julian Day to Unix timestamp</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>jdtounix</methodname>
<methodparam><type>int</type><parameter>julian_day</parameter></methodparam>
</methodsynopsis>
<para>
This function will return a Unix timestamp corresponding to the
Julian Day given in <parameter>julian_day</parameter>. The time returned is
UTC.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>julian_day</parameter></term>
<listitem>
<para>
A julian day number between <literal>2440588</literal> and <literal>106751993607888</literal>
on 64bit systems, or between <literal>2440588</literal> and <literal>2465443</literal> on 32bit systems.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
The unix timestamp for the start (midnight, not noon) of the given Julian day
</para>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
<para>
If <parameter>julian_day</parameter> is outside of the allowed range,
a <classname>ValueError</classname> is thrown.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.0.0</entry>
<entry>
This function no longer returns &false; on failure, but raises a
<classname>ValueError</classname> instead.
</entry>
</row>
<row>
<entry>7.3.24, 7.4.12</entry>
<entry>
The upper limit of <parameter>julian_day</parameter> has been extended. Previously,
it was <literal>2465342</literal> regardless of the architecture.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>unixtojd</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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