Fix 12-hour clock conversion edge cases

Author: cyf

format-clock-edge-cases/timeConverter.js

@@ -1,10 +1,13 @@
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
   if (hours === 0) {
-    return `${hours + 12}${time.slice(2, 5)} am`;
+    return `${String(hours + 12).padStart(2, "0")}${time.slice(2, 5)} am`;
+  }
+  if (hours === 12) {
+    return `${time} pm`;
   }
   if (hours > 12) {
-    return `${hours - 12}${time.slice(2, 5)} pm`;
+    return `${String(hours - 12).padStart(2, "0")}${time.slice(2, 5)} pm`;
   }
   return `${time} am`;
 }

format-clock-edge-cases/timeConverter.test.js

@@ -13,3 +13,11 @@ test("can correctly convert morning time", function () {
 test("can correctly convert midnight time", function () {
   assert.equal(formatAs12HourClock("00:00"), "12:00 am");
 });
+
+test("can correctly convert minutes", function () {
+  assert.equal(formatAs12HourClock("21:08"), "09:08 pm");
+});
+
+test("can correctly convert noon", function () {
+  assert.equal(formatAs12HourClock("12:30"), "12:30 pm");
+});