diff --git a/src/js/utils/index.js b/src/js/utils/index.js
index 69c58a7..c207d9d 100644
--- a/src/js/utils/index.js
+++ b/src/js/utils/index.js
@@ -127,7 +127,7 @@ export const formatDuration = (
   if (settingTimeTrackingHHMM) {
     const hours = Math.floor(durationInSeconds / 3600)
     const minutes = Math.floor((durationInSeconds % 3600) / 60)
-    const result = `${padCharsStart("0", 2, hours)}:${padCharsStart("0", 2, minutes)}`
+    const result = `${hours}:${padCharsStart("0", 2, minutes)}`
     if (!showSeconds) {
       return result
     } else {
diff --git a/test/utils/index.test.js b/test/utils/index.test.js
index 01fcffe..156bdf7 100644
--- a/test/utils/index.test.js
+++ b/test/utils/index.test.js
@@ -6,6 +6,7 @@ import {
   defaultTask,
   groupedProjectOptions,
   extractAndSetTag,
+  formatDuration,
 } from "../../src/js/utils"
 import { map, compose } from "lodash/fp"
 
@@ -142,4 +143,21 @@ describe("utils", () => {
       expect(extractAndSetTag(changeset)).toEqual(changeset)
     })
   })
+
+  describe("formatDuration", () => {
+    it("format with defaults", () => {
+      expect(formatDuration(3600)).toBe("1:00:00")
+      expect(formatDuration(3661)).toBe("1:01:01")
+    })
+
+    it("format without seconds", () => {
+      expect(formatDuration(3600, { showSeconds: false })).toBe("1:00")
+      expect(formatDuration(3661, { showSeconds: false })).toBe("1:01")
+    })
+
+    it("format in decimals", () => {
+      expect(formatDuration(3600, { settingTimeTrackingHHMM: false })).toBe("1.00")
+      expect(formatDuration(3661, { settingTimeTrackingHHMM: false })).toBe("1.02")
+    })
+  })
 })