<p>Every report requires a period to run over.  This is defined as a start date and end date,
and in more specific reports, a start time and end time.  These can
be entered manually by selecting <span class="keyword">Custom Period</span> from the <span class="reference">Period</span>
section of a <span class="reference">Report's selection criteria</span> window.  For ease-of-use and
simplicity, the report engine also provides the user with the ability
to select periods which are calculated at the time the report
is executed, thus sparing the user the task of having to check with a
calendar for specific dates.</p>

<p>When the report is executed, if the user has selected an in-built period, the reporting
engine simply substitutes the start and end dates based on the
current date and the period the user selected.</p>

<p>The built-in periods are based on a standard Gregorian calendar and are defined as
follows:</p>

<table class="confluenceTable">
	<tbody>
		<tr>
			<th class="confluenceTh" width=98>Period</th>
			<th class="confluenceTh">Description</th>
		</tr>
		<tr>
			<td class="confluenceTd"><b>Today</b></td>
			<td class="confluenceTd">The start and end dates are set to the current date. The start time is set to <span class="keyword">00:00:00</span> and the end time to the current time.</td>
		</tr>
		<tr>
			<td class="confluenceTd"><b>Yesterday</b></td>
			<td class="confluenceTd">The start and end dates are set to the current date minus one day. The start time is set to <span class="keyword">00:00:00</span> and the end time to <span class="keyword">23:59:59</span>.</td>
		</tr>
		<tr>
			<td class="confluenceTd"><b>Last week</b></td>
			<td class="confluenceTd">The start date is set to the date of the last Monday, and the end date is set to the start date plus seven days. The start time is set to <span class="keyword">00:00:00</span> 
			and the end time to <span class="keyword">23:59:59</span>.</td>
		</tr>
		<tr>
			<td class="confluenceTd"><b>Last month</b></td>
			<td class="confluenceTd">The start date for this period is set in three stages. The day is set to <span class="keyword">01</span>, the month is set to the current month minus one, or in the case of January, 
			it is set to <span class="keyword">12</span>. The year is set to the current year, unless it is a new year, in which case the year is reduced by one. The start and end times are set to 
			<span class="keyword">00:00:00</span> and <span class="keyword">23:59:59</span> respectively.</td>
		</tr>
		<tr>
			<td class="confluenceTd"><b>This year</b></td>
			<td class="confluenceTd">The start date is set to the first day of the first month of the current year, whilst the end date is set to today's date. The start and end times are set to 
			<span class="keyword">00:00:00</span> and <span class="keyword">23:59:59</span> respectively.</td>
		</tr>
		<tr>
			<td class="confluenceTd"><b>All calls</b></td>
			<td class="confluenceTd">The start and end dates and times are set to the date and time of the first and last call in the entire call database, respectively.</td>
		</tr>
	</tbody>
</table>

<p>In addition to the period, each report offers you the opportunity to interrogate
telephone system information from a specific site, or all sites.  In
the <span class="keyword">Site</span> drop-down list in each report's selection criteria
window, choose a site from the list, or to select all sites' data,
leave it blank.</p>