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<H2><A NAME="SECTION000420000000000000000">SLA_CLDJ - Calendar to MJD</A>
<A NAME="xref_SLA_CLDJ"> </A><A NAME="SLA_CLDJ"> </A>
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<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Gregorian Calendar to Modified Julian Date.
<DT><STRONG>CALL:</STRONG>
<DD><TT>CALL sla_CLDJ (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</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 2 = bad month</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
<TD ALIGN="LEFT"><B></B></TD>
<TD ALIGN="LEFT" NOWRAP> 3 = bad day</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTES:</STRONG>
<DD><DL COMPACT>
<DT>1.
<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.
<DT>2.
<DD>The year must be -4699 (<I>i.e.</I> 4700BC) or later.
For year <I>n</I>BC use IY = -(<I>n</I>-1).
<DT>3.
<DD>An alternative to the present routine is sla_CALDJ, which
accepts a year with the century missing.
</DL></DL>
<P> <DL>
<DT><STRONG>REFERENCE:</STRONG>
<DD>The algorithm is derived from that of Hatcher,
<I>Q.Jl.R.astr.Soc.</I> (1984) <B>25</B>, 53-55.
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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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