I have found that in my current version of Vicidial, as well as Vicibox (ViciBox_v8.x86_64-8.0.1.iso), the default Date/Time Ranges on the page do not populate with a date/time upon loading the page.
The two lines on the page which are supposed to set these are:
if (!isset($begin_query_time)) {$begin_query_time = "$NOW_DATE 09:00:00";}
if (!isset($end_query_time)) {$end_query_time = "$NOW_DATE 15:30:00";}
These do not work as they seem to be set earlier in the script at:
if (isset($_GET["begin_query_time"])) {$begin_query_time=$_GET["begin_query_time"];}
elseif (isset($_POST["begin_query_time"])) {$begin_query_time=$_POST["begin_query_time"];}
if (isset($_GET["end_query_time"])) {$end_query_time=$_GET["end_query_time"];}
elseif (isset($_POST["end_query_time"])) {$end_query_time=$_POST["end_query_time"];}