+my $open_sessions = '';
+if ( $cgi->param('open_sessions') =~ /^(\d*)$/ ) {
+ $open_sessions = $1;
+}
+
+my( $starttime_beginning, $starttime_ending ) = ( '', '' );
+if ( $cgi->param('starttime_beginning')
+ && $cgi->param('starttime_beginning') =~ /^([ 0-9\-\/\:\w]{0,54})$/ ) {
+ $starttime_beginning = str2time($1);
+}
+if ( $cgi->param('starttime_ending')
+ && $cgi->param('starttime_ending') =~ /^([ 0-9\-\/\:\w]{0,54})$/ ) {
+ $starttime_ending = str2time($1); # + 86399;
+}
+