Added a simple formater for durations

client/src/timely.test.ts

 
-import { formatDate, formatTime, formatDuration, formatRelativeTime, addTime, subtractTime } from 'timely';
+import {
+    formatDate,
+    formatTime,
+    formatDuration,
+    formatRelativeTime,
+    formatSimpleDuration,
+    addTime,
+    subtractTime,
+} from 'timely';
+
+test('simple duration format works as expected', () => {
+    expect(formatSimpleDuration(1.5 * 60 * 1000)).toEqual('01:30');
+});
+
+test('simple duration format can include hours', () => {
+    expect(formatSimpleDuration(5 * 60 * 60 * 1000 + 42.5 * 60 * 1000, true)).toEqual('05:42:30');
+});
+
+test('simple duration format can include milliseconds', () => {
+    expect(formatSimpleDuration(12345, false, false, true, true)).toEqual('12.345');
+});
 
 test('small durations format as `moments`', () => {
     expect(formatDuration(10 * 1000)).toEqual('moments');

client/src/timely.ts

@@ -35,6 +35,46 @@ export function formatDuration(millis: number, precision: Unit = 'minute'): stri
     return 'moments';
 }
 
+function formatNumber(value: number, places = 2, padding = '0'): string {
+    let result = Math.floor(value).toString();
+    while (result.length < places) {
+        result = padding + result;
+    }
+    return result;
+}
+
+export function formatSimpleDuration(millis: number, hours = false, minutes = true, seconds = true, milliseconds = false): string {
+    let result = '';
+    if (hours) {
+        const hour = Math.floor(millis / UNITS['hour']);
+        millis -= hour * UNITS['hour'];
+        result += formatNumber(hour);
+    }
+    if (minutes) {
+        if (result.length !== 0) {
+            result += ':';
+        }
+        const min = Math.floor(millis / UNITS['minute']);
+        millis -= min * UNITS['minute'];
+        result += formatNumber(min);
+    }
+    if (seconds) {
+        if (result.length !== 0) {
+            result += ':';
+        }
+        const sec = Math.floor(millis / UNITS['second']);
+        millis -= sec * UNITS['second'];
+        result += formatNumber(sec);
+    }
+    if (milliseconds) {
+        if (result.length !== 0) {
+            result += '.';
+        }
+        result += formatNumber(millis, 3);
+    }
+    return result;
+}
+
 function formatOrdinal(value: number): string {
     value = Math.floor(value);
     if (value === 1 || (value % 10 === 1 && value > 20)) {
@@ -48,14 +88,6 @@ function formatOrdinal(value: number): string {
     }
 }
 
-function formatNumber(value: number, places = 2, padding = '0'): string {
-    let result = Math.floor(value).toString();
-    while (result.length < places) {
-        result = padding + result;
-    }
-    return result;
-}
-
 const MONTHS = [
     'January',
     'February',