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<h1>22. Virtuoso Functions Guide - datediff</h1>
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datestring,
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<a class="selected" href="fn_datediff.html">datediff</a>
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<a href="fn_datestring_gmt.html">datestring_gmt</a>
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<a href="fn_dayofmonth.html">dayofmonth</a>
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<div id="text">
<h2>datediff</h2>
<div class="refpurpose">get difference of 2 dates</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">datediff</span>
</span>
(<span class="paramdef">in <span class="parameter">unit</span> string</span>,
<span class="paramdef">in <span class="parameter">date1</span> datetime</span>,
<span class="paramdef">in <span class="parameter">date2</span> datetime</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>datediff subtracts date1 from date2 and returns the difference as
an integer in the specified units.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">unit – </span>
The resulting unit name as a string. May be 'millisecond', 'second', 'minute', 'hour', 'day',
'month', or 'year'
</div>
<div class="refsect2">
<span class="refsect2title">date1 – </span>
The <span class="computeroutput">datetime</span> value that will be subtracted from
<span class="computeroutput">date2</span>
</div>
<div class="refsect2">
<span class="refsect2title">date2 – </span>
The <span class="computeroutput">datetime</span> value <span class="computeroutput">date1</span>
is subtracted from
</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Values</div>
<p>Difference of <span class="computeroutput">date1</span> and
<span class="computeroutput">date2</span> as an <span class="computeroutput">integer</span>.</p>
</div>
<div class="refsect1title">Errors</div>
<table class="data">
<tr>
<th class="data">SQLState</th>
<th class="data">Error Code</th>
<th class="data">Error Text</th>
<th class="data">Description</th>
</tr>
<tr>
<td class="data">
<a name="err22023" />
<span class="errorcode">22023</span>
</td>
<td class="data">
<a name="errDT002" />
<span class="errorcode">DT002</span>
</td>
<td class="data">
<span class="errorname">Bad unit in datediff: >offending unit string<</span>
</td>
<td class="data">The unit given was not one of the units listed above.</td>
</tr>
</table>
<br />
<p />
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_datediff" />
<div class="example">
<div class="exampletitle">A simple example</div>
<p>Get hour difference of 1996.10.10 and 1996.10.11.</p>
<div>
<pre class="screen">SQL> SELECT datediff ('hour', stringdate ('1996.10.10'), stringdate ('1996.10.11'));
callret
INTEGER
_________________________________________________________________________
24
1 Rows. -- 57 msec.
</pre>
</div>
</div>
<a name="ex_datediff_2" />
<div class="example">
<div class="exampletitle">Demo DB example</div>
<p>Get average order processing time in days</p>
<div>
<pre class="screen">
SQL> use "Demo";
SQL> SELECT avg (datediff ('day', "OrderDate", "ShippedDate"))
as "Avg_Processing_Time" from "Orders" where "ShippedDate" is not null;
Avg_Processing_Time
INTEGER
_________________________________________________________________________
8
1 Rows. -- 11 msec.
</pre>
</div>
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<div class="refsect1">
<div class="refsect1title">See Also</div>
<p>
<a href="fn_dateadd.html">dateadd</a>,
<a href="fn_datestring.html">datestring</a>
</p>
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