diff --git a/ui/src/Components/Fetcher/index.test.js b/ui/src/Components/Fetcher/index.test.js
index ada3c8fce..b4417364e 100644
--- a/ui/src/Components/Fetcher/index.test.js
+++ b/ui/src/Components/Fetcher/index.test.js
@@ -20,7 +20,7 @@ beforeAll(() => {
 });
 
 beforeEach(() => {
-  advanceTo(new Date(2000, 1, 1, 0, 0, 0));
+  advanceTo(new Date(Date.UTC(2000, 1, 1, 0, 0, 0)));
 
   alertStore = new AlertStore(["label=value"]);
   fetchSpy = jest
diff --git a/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/index.test.js b/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/index.test.js
index d7e89b390..f62772480 100644
--- a/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/index.test.js
+++ b/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/index.test.js
@@ -20,7 +20,7 @@ let alertStore;
 let silenceFormStore;
 
 beforeEach(() => {
-  advanceTo(new Date(2018, 7, 15, 20, 40, 0));
+  advanceTo(new Date(Date.UTC(2018, 7, 15, 20, 40, 0)));
   alertStore = new AlertStore([]);
   silenceFormStore = new SilenceFormStore();
 });