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<H2><A NAME="SECTION000431000000000000000">SLA_DAT - TAI-UTC</A>
<A NAME="xref_SLA_DAT"> </A><A NAME="SLA_DAT"> </A>
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<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Increment to be applied to Coordinated Universal Time UTC to give
International Atomic Time TAI.
<P> <DT><STRONG>CALL:</STRONG>
<DD><TT>D = sla_DAT (UTC)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>UTC</EM></TD>
<TH ALIGN="LEFT"><B>D</B></TH>
<TD ALIGN="LEFT" NOWRAP>UTC date as a modified JD (JD-2400000.5)</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>sla_DAT</EM></TD>
<TH ALIGN="LEFT"><B>D</B></TH>
<TD ALIGN="LEFT" NOWRAP>TAI-UTC in seconds</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTES:</STRONG>
<DD><DL COMPACT>
<DT>1.
<DD>The UTC is specified to be a date rather than a time to indicate
that care needs to be taken not to specify an instant which lies
within a leap second. Though in most cases UTC can include the
fractional part, correct behaviour on the day of a leap second
can be guaranteed only up to the end of the second
<IMG WIDTH="82" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="img54.gif"
ALT="$23^{\rm h}\,59^{\rm m}\,59^{\rm s}$">. <DT>2.
<DD>UTC began at 1960 January 1. To specify a UTC prior to this
date would be meaningless; in such cases the parameters
for the year 1960 are used by default.
<DT>3.
<DD>This routine has to be updated on each occasion that a
leap second is announced, and programs using it relinked.
Refer to the program source code for information on when the
most recent leap second was added.
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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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