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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
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- Copyright (C) 1998-2018 OpenLink Software
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- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
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- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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-->
<refentry id="fn_dateadd">
<refmeta>
<refentrytitle>dateadd</refentrytitle>
<refmiscinfo>time</refmiscinfo>
</refmeta>
<refnamediv>
<refname>dateadd</refname>
<refpurpose>arithmetic add to a date</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_dateadd">
<funcprototype id="fproto_dateadd">
<funcdef><function>dateadd</function></funcdef>
<paramdef>in <parameter>unit</parameter> string</paramdef>
<paramdef>in <parameter>number</parameter> integer</paramdef>
<paramdef>in <parameter>date</parameter> datetime</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_dateadd">
<title>Description</title>
<para>dateadd adds a positive or negative quantity of units to a date
(in the internal date time format), and returns a new date so formed.
The unit is specified as a string and can be one of the following:
'second', 'minute', 'hour', 'day', 'month', or 'year'.
Use datestring to convert the result to a human-readable string.</para>
</refsect1>
<refsect1 id="params_dateadd"><title>Parameters</title>
<refsect2><title>unit</title>
<para>String value denoting the unit to use in the addition.</para></refsect2>
<refsect2><title>number</title>
<para>Integer number of <parameter>unit</parameter> units to be added.</para>
</refsect2>
<refsect2><title>date</title>
<para>Datetime value to which the <parameter>number</parameter>
of <parameter>unit</parameter>s is to be added</para>
</refsect2>
</refsect1>
<!-- <refsect1 id="errors_dateadd"><title>Errors</title>
<table><title>Errors signalled by <function>dateadd</function></title>
<tgroup cols="4">
<thead><row><entry>SQLState</entry><entry>Error Code</entry><entry>Error Text</entry><entry>Description</entry></row></thead>
<tbody>
<row>
<entry><errorcode></errorcode></entry>
<entry><errorcode></errorcode></entry>
<entry><errorname></errorname></entry>
<entry></entry>
</row>
</tbody>
</tgroup>
</table>
</refsect1> -->
<refsect1 id="examples_dateadd"><title>Examples</title>
<example id="ex_dateadd"><title>Simple date addition</title>
<para>Add 10 days to 1996.10.10.</para>
<screen>
SQL> select dateadd ('day', 10, stringdate ('1996.10.10'));
callret
BINARY
_______________________________________________________________________________
1996-10-20 01:00:00
1 Rows. -- 92 msec.
</screen>
</example>
</refsect1>
<refsect1 id="seealso_dateadd"><title>See Also</title>
<para><link linkend="fn_datediff">datediff</link>, <link linkend="fn_datestring">datestring</link>, <link linkend="fn_stringdate">stringdate</link></para>
</refsect1>
</refentry>
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