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<H2><A NAME="SECTION000415000000000000000">SLA_CALDJ - Calendar Date to MJD</A>
<A NAME="xref_SLA_CALDJ"> </A><A NAME="SLA_CALDJ"> </A>
</H2>
<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Gregorian Calendar to Modified Julian Date, with century default.
<DT><STRONG>CALL:</STRONG>
<DD><TT>CALL sla_CALDJ (IY, IM, ID, DJM, J)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>IY,IM,ID</EM></TD>
<TH ALIGN="LEFT"><B>I</B></TH>
<TD ALIGN="LEFT" NOWRAP>year, month, day in Gregorian calendar</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>DJM</EM></TD>
<TH ALIGN="LEFT"><B>D</B></TH>
<TD ALIGN="LEFT" NOWRAP>modified Julian Date (JD-2400000.5) for <IMG WIDTH="18" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="img49.gif"
ALT="$0^{\rm h}$"></TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>J</EM></TD>
<TD ALIGN="LEFT"><B>I</B></TD>
<TD ALIGN="LEFT" NOWRAP>status:</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 0 = OK</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 1 = bad year (MJD not computed)</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 2 = bad month (MJD not computed)</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 3 = bad day (MJD computed)</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTES:</STRONG>
<DD><DL COMPACT>
<DT>1.
<DD>This routine supports the <I>century default</I> feature.
Acceptable years are:
<UL>
<LI> 00-49, interpreted as 2000-2049,
<LI> 50-99, interpreted as 1950-1999, and
<LI> 100 upwards, interpreted literally.
</UL>
For 1-100AD use the routine sla_CLDJ instead.
<DT>2.
<DD>For year <I>n</I>BC use IY = -(<I>n</I>-1).
<DT>3.
<DD>When an invalid year or month is supplied (status J = 1 or 2)
the MJD is <B>not</B> computed. When an invalid day is supplied
(status J = 3) the MJD <B>is</B> computed.
</DL></DL>
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<ADDRESS>
<I>SLALIB --- Positional Astronomy Library<BR>Starlink User Note 67<BR>P. T. Wallace<BR>12 October 1999<BR>E-mail:ptw@star.rl.ac.uk</I>
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