diff --git a/devel/705.md b/devel/705.md
new file mode 100644
index 0000000000..0af81a75f4
--- /dev/null
+++ b/devel/705.md
@@ -0,0 +1,6 @@
+[705] 解决 WASM 环境下`QDateTime` UTC 处理问题
+# What
+在 Qt WASM 环境中，`QTimeZone` API 存在差异，原实现所用的 `QTimeZone::utc()` 的无法使用
+
+# How
+在 WASM 平台使用 `toUTC()` 
diff --git a/src/Mogan/Cache/thumbnail_loader.cpp b/src/Mogan/Cache/thumbnail_loader.cpp
index 49f6d89d73..51215e24c3 100644
--- a/src/Mogan/Cache/thumbnail_loader.cpp
+++ b/src/Mogan/Cache/thumbnail_loader.cpp
@@ -133,7 +133,12 @@ ThumbnailLoader::processQueue () {
                   lmStr, "ddd, dd MMM yyyy hh:mm:ss 'GMT'");
             }
             if (lastModified.isValid ()) {
+#ifdef OS_WASM
+              // WASM version of Qt seems to have difference API on this
+              lastModified= lastModified.toUTC ();
+#else
               lastModified.setTimeZone (QTimeZone::utc ());
+#endif
             }
           }
 
diff --git a/src/Plugins/Qt/qt_pdf_preview_widget.cpp b/src/Plugins/Qt/qt_pdf_preview_widget.cpp
index 6faab28470..d477673c78 100644
--- a/src/Plugins/Qt/qt_pdf_preview_widget.cpp
+++ b/src/Plugins/Qt/qt_pdf_preview_widget.cpp
@@ -429,7 +429,12 @@ QTPdfPreviewWidget::processNetworkReply (QPointer<QNetworkReply> reply) {
       lastModified= QDateTime::fromString (lastModStr, Qt::RFC2822Date);
     }
     if (lastModified.isValid ()) {
+#ifdef OS_WASM
+      // WASM version of Qt seems to have difference API on this
+      lastModified= lastModified.toUTC ();
+#else
       lastModified.setTimeZone (QTimeZone::utc ());
+#endif
     }
   }