diff --git a/application/controllers/Logbook.php b/application/controllers/Logbook.php
index f9247db90..b5ee58806 100644
--- a/application/controllers/Logbook.php
+++ b/application/controllers/Logbook.php
@@ -54,8 +54,6 @@ class Logbook extends CI_Controller {
 				$data['qra'] = "none";
 		}
 
-
-
 		// load the view
 		$data['page_title'] = __("Logbook");
 
@@ -79,6 +77,10 @@ class Logbook extends CI_Controller {
 
 		// Normalize the date only if it's not empty
 		if (!empty($date)) {
+			if (strpos($date, '_') !== false) {
+				// Replace slashes with dashes for URL processing
+				$date = str_replace('_', '/', $date);
+			}
 			// Get user-preferred date format
 			if ($this->session->userdata('user_date_format')) {
 				$date_format = $this->session->userdata('user_date_format');
diff --git a/assets/js/sections/qso.js b/assets/js/sections/qso.js
index 6a61c6e51..b3b5af6cb 100644
--- a/assets/js/sections/qso.js
+++ b/assets/js/sections/qso.js
@@ -830,9 +830,13 @@ $("#callsign").on("focusout", function () {
 		}
 		const json_mode = $("#mode").val();
 
-		var find_callsign = $(this).val().toUpperCase();
-		var callsign = find_callsign;
-		const startDate = encodeURIComponent($('#start_date').val());
+		let find_callsign = $(this).val().toUpperCase();
+		let callsign = find_callsign;
+		let startDate = $('#start_date').val();
+		if (startDate.includes('/')) {
+			startDate = startDate.replaceAll('/', '_');
+		}
+		startDate = encodeURIComponent(startDate);
 		const stationProfile = $('#stationProfile').val();
 
 		find_callsign = find_callsign.replace(/\//g, "-");