<HTML ><HEAD ><TITLE >GregorianToJD</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="PHP Manual" HREF="index.html"><LINK REL="UP" TITLE="Calendar functions" HREF="ref.calendar.html"><LINK REL="PREVIOUS" TITLE="FrenchToJD" HREF="function.frenchtojd.html"><LINK REL="NEXT" TITLE="JDDayOfWeek" HREF="function.jddayofweek.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.frenchtojd.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.jddayofweek.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.gregoriantojd" ></A >GregorianToJD</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN10371" ></A ><P > (PHP 3, PHP 4 )</P >GregorianToJD -- Converts a Gregorian date to Julian Day Count </DIV ><DIV CLASS="refsect1" ><A NAME="AEN10374" ></A ><H2 >Description</H2 >int <B CLASS="methodname" >gregoriantojd</B > ( int month, int day, int year)<BR ></BR ><P > Valid Range for Gregorian Calendar 4714 B.C. to 9999 A.D.</P ><P > Although this function can handle dates all the way back to 4714 B.C., such use may not be meaningful. The Gregorian calendar was not instituted until October 15, 1582 (or October 5, 1582 in the Julian calendar). Some countries did not accept it until much later. For example, Britain converted in 1752, The USSR in 1918 and Greece in 1923. Most European countries used the Julian calendar prior to the Gregorian. <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN10390" ></A ><P ><B >Example 1. Calendar functions</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="php" ><?php $jd = GregorianToJD (10,11,1970); echo "$jd\n"; $gregorian = JDToGregorian ($jd); echo "$gregorian\n"; ?></PRE ></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.frenchtojd.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.jddayofweek.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >FrenchToJD</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.calendar.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >JDDayOfWeek</TD ></TR ></TABLE ></DIV ></BODY ></HTML >