diff --git a/src/tools/duration-calculator/duration-calculator.service.test.ts b/src/tools/duration-calculator/duration-calculator.service.test.ts
index 9035587a..8db3c061 100644
--- a/src/tools/duration-calculator/duration-calculator.service.test.ts
+++ b/src/tools/duration-calculator/duration-calculator.service.test.ts
@@ -123,11 +123,11 @@ describe('duration-calculator', () => {
           iso8601Duration: 'P0Y0M0DT2H40M15S',
           milliseconds: 9615125,
           minutes: 160.25208333333333,
-          prettified: '2h 40m 15.1s',
+          prettified: '2h 40m 15s 125ms',
           prettifiedColonNotation: '2:40:15.1',
           prettifiedDaysColon: '02:40:15.125',
           prettifiedHoursColon: '02:40:15.125',
-          prettifiedVerbose: '2 hours 40 minutes 15.1 seconds',
+          prettifiedVerbose: '2 hours 40 minutes 15 seconds 125 milliseconds',
           seconds: 9615.125,
           weeks: 0.01589802414021164,
           years: 0.00030489361364789447,
@@ -178,11 +178,11 @@ describe('duration-calculator', () => {
           iso8601Duration: 'P0Y0M0DT12H20M0S',
           milliseconds: 44400020.3,
           minutes: 740.0003383333333,
-          prettified: '12h 20m',
+          prettified: '12h 20m 20ms 300µs',
           prettifiedColonNotation: '12:20:00',
           prettifiedDaysColon: '12:20:00.20.299999997019768',
           prettifiedHoursColon: '12:20:00.20.299999997019768',
-          prettifiedVerbose: '12 hours 20 minutes',
+          prettifiedVerbose: '12 hours 20 minutes 20 milliseconds 300 microseconds',
           seconds: 44400.0203,
           weeks: 0.07341273197751322,
           years: 0.0014079154077879248,
@@ -309,5 +309,25 @@ describe('duration-calculator', () => {
         },
       });
     });
+    it('support timespan format d.hh:mm:ss.fff', () => {
+      expect(computeDuration('3.12:12:12\n-1.12:12:12\n+0:0:0.125')).to.deep.eq({
+        errors: [],
+        total: {
+          days: 2.000001446759259,
+          hours: 48.000034722222225,
+          iso8601Duration: 'P0Y0M2DT0H0M0S',
+          milliseconds: 172800125,
+          minutes: 2880.0020833333333,
+          prettified: '2d 125ms',
+          prettifiedColonNotation: '2:00:00:00.1',
+          prettifiedDaysColon: '2d 00:00:00.125',
+          prettifiedHoursColon: '48:00:00.125',
+          prettifiedVerbose: '2 days 125 milliseconds',
+          seconds: 172800.125,
+          weeks: 0.2857144923941799,
+          years: 0.005479456018518519,
+        },
+      });
+    });
   });
 });
diff --git a/src/tools/duration-calculator/duration-calculator.service.ts b/src/tools/duration-calculator/duration-calculator.service.ts
index 98dc4c85..dd47de17 100644
--- a/src/tools/duration-calculator/duration-calculator.service.ts
+++ b/src/tools/duration-calculator/duration-calculator.service.ts
@@ -61,22 +61,24 @@ export function computeDuration(s: string): {
 }
 
 function convertDurationMS(s: string): number | undefined {
-  const hoursHandled = s.replace(/\b(\d+):(\d+)(?::(\d+)(?:\.(\d+))?)?/g, (_, h, m, s, ms) => {
-    const timeArr: string[] = [];
-    const addPart = (part: string, unit: string) => {
-      const num = Number.parseInt(part, 10);
-      if (Number.isNaN(num)) {
-        return;
-      }
+  const hoursHandled = s.replace(/\b(?:(\d+)\.)?(\d+):(\d+)(?::(\d+)(?:\.(\d+))?)?\b/g,
+    (_, d, h, m, s, ms) => {
+      const timeArr: string[] = [];
+      const addPart = (part: string, unit: string) => {
+        const num = Number.parseInt(part, 10);
+        if (Number.isNaN(num)) {
+          return;
+        }
 
-      timeArr.push(`${num}${unit}`);
-    };
-    addPart(h, 'h');
-    addPart(m, 'm');
-    addPart(s, 's');
-    addPart(ms, 'ms');
-    return timeArr.join(' ');
-  });
+        timeArr.push(`${num}${unit}`);
+      };
+      addPart(d, 'd');
+      addPart(h, 'h');
+      addPart(m, 'm');
+      addPart(s, 's');
+      addPart(ms, 'ms');
+      return timeArr.join(' ');
+    });
   if (!hoursHandled) {
     return 0;
   }
@@ -95,9 +97,9 @@ function convertDurationMS(s: string): number | undefined {
 function prepareDurationResult(durationMS: any): ConvertedDuration {
   const dateFnsDuration = intervalToDuration({ start: 0, end: durationMS });
   return {
-    prettified: prettyMilliseconds(durationMS),
-    prettifiedVerbose: prettyMilliseconds(durationMS, { verbose: true }),
-    prettifiedColonNotation: prettyMilliseconds(durationMS, { colonNotation: true }),
+    prettified: prettyMilliseconds(durationMS, { formatSubMilliseconds: true }),
+    prettifiedVerbose: prettyMilliseconds(durationMS, { verbose: true, formatSubMilliseconds: true }),
+    prettifiedColonNotation: prettyMilliseconds(durationMS, { colonNotation: true, formatSubMilliseconds: true }),
     prettifiedDaysColon: hhmmss(durationMS, true),
     prettifiedHoursColon: hhmmss(durationMS, false),
     iso8601Duration: formatISODuration(dateFnsDuration),