diff --git a/test/spec/filters/timezoneOffsetToUtcSpec.js b/test/spec/filters/timezoneOffsetToUtcSpec.js
new file mode 100644
index 0000000000..1840438451
--- /dev/null
+++ b/test/spec/filters/timezoneOffsetToUtcSpec.js
@@ -0,0 +1,20 @@
+describe('timezoneOffsetToUtc', function() {
+
+  beforeEach(module('habitrpg'));
+
+  it('formats the timezone offset with a - sign if the offset is positive', inject(function(timezoneOffsetToUtcFilter) {
+    expect(timezoneOffsetToUtcFilter(90)).to.eql('UTC-1:30');
+  }));
+
+  it('formats the timezone offset with a + sign if the offset is negative', inject(function(timezoneOffsetToUtcFilter) {
+    expect(timezoneOffsetToUtcFilter(-525)).to.eql('UTC+8:45');
+  }));
+
+  it('prepends the minutes with a 0 if the minute the offset is less than 10', inject(function(timezoneOffsetToUtcFilter) {
+    expect(timezoneOffsetToUtcFilter(60)).to.eql('UTC-1:00');
+  }));
+
+  it('returns the string UTC+0:00 if the offset is 0', inject(function(timezoneOffsetToUtcFilter) {
+    expect(timezoneOffsetToUtcFilter(0)).to.eql('UTC+0:00');
+  }));
+});