diff --git a/src/plugin-qt/thememanager/sunrisesunset.cpp b/src/plugin-qt/thememanager/sunrisesunset.cpp
index f5123896..281a5f95 100644
--- a/src/plugin-qt/thememanager/sunrisesunset.cpp
+++ b/src/plugin-qt/thememanager/sunrisesunset.cpp
@@ -1,10 +1,9 @@
-// SPDX-FileCopyrightText: 2025 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2025 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
 #include "sunrisesunset.h"
 
-#include <QDebug>
 #include <QtMath>
 #include <QTime>
 
@@ -96,8 +95,9 @@ bool SunriseSunset::getSunriseSunset(double latitude, double longitude, double u
     if (sunsetUT <= -100) // 长昼 返回的sunrise-sunset区间用于判断当前是否为白天
         sunsetUT = 100;
 
-    sunrise = date.startOfDay().addMSecs(static_cast<int>(sunriseUT * 3600 * 1000));
-    sunset = date.startOfDay().addMSecs(static_cast<int>(sunsetUT * 3600 * 1000));
-    qInfo() << __FUNCTION__ << date << latitude << longitude << sunriseUT << sunrise << sunsetUT << sunset;
+    const QDateTime startOfDay = date.startOfDay();
+    sunrise = startOfDay.addMSecs(static_cast<int>(sunriseUT * 3600 * 1000));
+    sunset = startOfDay.addMSecs(static_cast<int>(sunsetUT * 3600 * 1000));
+
     return true;
 }
diff --git a/src/plugin-qt/thememanager/thememanager.cpp b/src/plugin-qt/thememanager/thememanager.cpp
index 8df4e8b8..223df2f5 100644
--- a/src/plugin-qt/thememanager/thememanager.cpp
+++ b/src/plugin-qt/thememanager/thememanager.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2025 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2025 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
@@ -158,6 +158,16 @@ void ThemeManager::autoSetTheme(double latitude, double longitude)
     }
 
     if (m_curThemeType != themeType) {
+        qInfo().noquote().nospace()
+            << "[thememanager] Auto theme change requested: from="
+            << (m_curThemeType.isEmpty() ? QStringLiteral("unset") : m_curThemeType)
+            << ", to=" << themeType
+            << ", current_time=" << curr.toString(Qt::ISODate)
+            << ", latitude=" << latitude
+            << ", longitude=" << longitude
+            << ", utc_offset_hours=" << utcOffset
+            << ", sunrise=" << sunrise.toString(Qt::ISODate)
+            << ", sunset=" << sunset.toString(Qt::ISODate);
         m_curThemeType = themeType;
         doSetGlobalTheme(themeType);
     }