diff --git a/src/Calendars/Main.tsx b/src/Calendars/Main.tsx
index 859ddc8..320da45 100644
--- a/src/Calendars/Main.tsx
+++ b/src/Calendars/Main.tsx
@@ -65,7 +65,7 @@ export default function CalendarsMain() {
     const collection = collections!.find((x) => x.uid === collectionUid)!;
     const itemMgr = colMgr.getItemManager(collection);
 
-    const mtime = (new Date()).getUTCMilliseconds();
+    const mtime = (new Date()).getTime();
     const content = item.toIcal();
 
     let eteItem;
@@ -95,7 +95,7 @@ export default function CalendarsMain() {
     const itemMgr = colMgr.getItemManager(collection);
 
     const eteItem = items!.get(collectionUid)?.get(itemUid)!;
-    const mtime = (new Date()).getUTCMilliseconds();
+    const mtime = (new Date()).getTime();
     const meta = await eteItem.getMeta();
     meta.mtime = mtime;
     await eteItem.setMeta(meta);
diff --git a/src/Collections/ImportDialog.tsx b/src/Collections/ImportDialog.tsx
index 7b45f43..796d576 100644
--- a/src/Collections/ImportDialog.tsx
+++ b/src/Collections/ImportDialog.tsx
@@ -61,7 +61,7 @@ export default function ImportDialog(props: PropsType) {
 
         const eteItems = [];
         for (const item of items) {
-          const mtime = (new Date()).getUTCMilliseconds();
+          const mtime = (new Date()).getTime();
           const meta = {
             mtime,
             name: item.uid,
diff --git a/src/Contacts/Main.tsx b/src/Contacts/Main.tsx
index 23b2616..9addfa9 100644
--- a/src/Contacts/Main.tsx
+++ b/src/Contacts/Main.tsx
@@ -61,7 +61,7 @@ export default function ContactsMain() {
     const collection = collections!.find((x) => x.uid === collectionUid)!;
     const itemMgr = colMgr.getItemManager(collection);
 
-    const mtime = (new Date()).getUTCMilliseconds();
+    const mtime = (new Date()).getTime();
     const content = item.toIcal();
 
     let eteItem;
@@ -91,7 +91,7 @@ export default function ContactsMain() {
     const itemMgr = colMgr.getItemManager(collection);
 
     const eteItem = items!.get(collectionUid)?.get(itemUid)!;
-    const mtime = (new Date()).getUTCMilliseconds();
+    const mtime = (new Date()).getTime();
     const meta = await eteItem.getMeta();
     meta.mtime = mtime;
     await eteItem.setMeta(meta);
diff --git a/src/Tasks/Main.tsx b/src/Tasks/Main.tsx
index 5df1dc3..5eee8c2 100644
--- a/src/Tasks/Main.tsx
+++ b/src/Tasks/Main.tsx
@@ -61,7 +61,7 @@ export default function TasksMain() {
     const collection = collections!.find((x) => x.uid === collectionUid)!;
     const itemMgr = colMgr.getItemManager(collection);
 
-    const mtime = (new Date()).getUTCMilliseconds();
+    const mtime = (new Date()).getTime();
     const content = item.toIcal();
 
     let eteItem;
@@ -91,7 +91,7 @@ export default function TasksMain() {
     const itemMgr = colMgr.getItemManager(collection);
 
     const eteItem = items!.get(collectionUid)?.get(itemUid)!;
-    const mtime = (new Date()).getUTCMilliseconds();
+    const mtime = (new Date()).getTime();
     const meta = await eteItem.getMeta();
     meta.mtime = mtime;
     await eteItem.setMeta(meta);