diff --git a/application/views/dashboard/index.php b/application/views/dashboard/index.php
index e49ba5ef6..bd4893f90 100644
--- a/application/views/dashboard/index.php
+++ b/application/views/dashboard/index.php
@@ -178,9 +178,9 @@ function echo_table_col($row, $name) {
 
 					?>
 
-					<td><?php $timestamp = strtotime($row->COL_TIME_ON); echo date($custom_date_format, $timestamp); ?></td>
+					<td><?php $timestamp = strtotime($row->COL_TIME_ON ?? '1970-01-01 00:00:00'); echo date($custom_date_format, $timestamp); ?></td>
 					<?php if(($this->config->item('use_auth') && ($this->session->userdata('user_type') >= 2)) || $this->config->item('use_auth') === FALSE || ($this->config->item('show_time'))) { ?>
-					<td><?php $timestamp = strtotime($row->COL_TIME_ON); echo date('H:i', $timestamp); ?></td>
+					<td><?php $timestamp = strtotime($row->COL_TIME_ON ?? '1970-01-01 00:00:00'); echo date('H:i', $timestamp); ?></td>
 
 					<?php } ?>
 					<td>
diff --git a/application/views/search/search_result_ajax.php b/application/views/search/search_result_ajax.php
index e81a82db7..f961bccbb 100644
--- a/application/views/search/search_result_ajax.php
+++ b/application/views/search/search_result_ajax.php
@@ -144,9 +144,9 @@ $ci =& get_instance();
                 }
             ?>
             <?php  echo '<tr class="tr'.($i & 1).'" id="qso_'. $row->COL_PRIMARY_KEY .'">'; ?>
-            <td><?php $timestamp = strtotime($row->COL_TIME_ON); echo date($custom_date_format, $timestamp); ?></td>
+            <td><?php $timestamp = strtotime($row->COL_TIME_ON ?? '1970-01-01 00:00:00'); echo date($custom_date_format, $timestamp); ?></td>
             <?php if(($this->config->item('use_auth') && ($this->session->userdata('user_type') >= 2)) || $this->config->item('use_auth') === FALSE || ($this->config->item('show_time'))) { ?>
-                <td><?php $timestamp = strtotime($row->COL_TIME_ON); echo date('H:i', $timestamp); ?></td>
+                <td><?php $timestamp = strtotime($row->COL_TIME_ON ?? '1970-01-01 00:00:00'); echo date('H:i', $timestamp); ?></td>
             <?php } ?>
             <td>
                 <a id="edit_qso" href="javascript:displayQso(<?php echo $row->COL_PRIMARY_KEY; ?>)"><?php echo str_replace("0","&Oslash;",strtoupper($row->COL_CALL)); ?></a>
diff --git a/application/views/view_log/partial/log_ajax.php b/application/views/view_log/partial/log_ajax.php
index e729096cc..cb06b0661 100644
--- a/application/views/view_log/partial/log_ajax.php
+++ b/application/views/view_log/partial/log_ajax.php
@@ -104,9 +104,9 @@ function echo_table_col($row, $name) {
                     $custom_date_format = $this->config->item('qso_date_format');
                 }
                 echo '<tr class="tr'.($i & 1).'" id="qso_'. $row->COL_PRIMARY_KEY .'">'; ?>
-            <td><?php $timestamp = strtotime($row->COL_TIME_ON); echo date($custom_date_format, $timestamp); ?></td>
+            <td><?php $timestamp = strtotime($row->COL_TIME_ON ?? '1970-01-01 00:00:00'); echo date($custom_date_format, $timestamp); ?></td>
             <?php if(($this->config->item('use_auth') && ($this->session->userdata('user_type') >= 2)) || $this->config->item('use_auth') === FALSE || ($this->config->item('show_time'))) { ?>
-                <td><?php $timestamp = strtotime($row->COL_TIME_ON); echo date('H:i', $timestamp); ?></td>
+                <td><?php $timestamp = strtotime($row->COL_TIME_ON ?? '1970-01-01 00:00:00'); echo date('H:i', $timestamp); ?></td>
             <?php } ?>
             <td>
                 <a id="edit_qso" href="javascript:displayQso(<?php echo $row->COL_PRIMARY_KEY; ?>)"><?php echo str_replace("0","&Oslash;",strtoupper($row->COL_CALL)); ?></a>
diff --git a/src/QSLManager/QSO.php b/src/QSLManager/QSO.php
index 3e524dead..813804423 100644
--- a/src/QSLManager/QSO.php
+++ b/src/QSLManager/QSO.php
@@ -144,7 +144,7 @@ class QSO
 			// Get Default date format from /config/wavelog.php
 			$custom_date_format = $CI->config->item('qso_date_format');
 		}
-		$this->qsoDateTime = date($custom_date_format . " H:i", strtotime($data['COL_TIME_ON']));
+		$this->qsoDateTime = date($custom_date_format . " H:i", strtotime($data['COL_TIME_ON'] ?? '1970-01-01 00:00:00'));
 
 		$this->de = $data['station_callsign'];
 		$this->dx = $data['COL_CALL'];