adding time conversion function

src/timeConversion.js

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+export default timeConversion
+
+/**
+* Original Source: https://stackoverflow.com/questions/46883149
+* This method will calculate the time difference
+* between two time values
+*
+* @param {String} startTime - string with the start time in hh:mm format
+* @param {String} endTime - string with the end time in hh:mm format
+* @return {String} - should return a string with the time difference in hh:mm format
+*/
+
+function timeConversion(time) {
+
+  let convertedTime = time.substr(2, 6)
+  if (time.charAt(8) === 'A') {
+    if (time.charAt(0) === '1' && time.charAt(1) === '2') {
+      convertedTime = '00'.concat(convertedTime)
+    } else {
+      convertedTime = time.substr(0, 2) + convertedTime
+    }
+  }
+  if (time.charAt(8) === 'P') {
+    if (time.charAt(0) === '1' && time.charAt(1) === '2') {
+      convertedTime = '12'.concat(convertedTime)
+    } else {
+      const a = time.substr(0, 2)
+      const b = Number(a)
+      const c = (b + 12).toString()
+      convertedTime = c.concat(convertedTime)
+    }
+  }
+  return convertedTime
+}

test/timeConversion.test.js

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+import test from 'ava'
+import timeConversions from '../src/timeConversion'
+
+test('returns the time in 24 hours format', time => {
+    const timeGiven = "01:12:48AM"
+    const expectedTime = "01:12:48"
+    const actualTime = timeConversions(timeGiven)
+    time.is(actualTime, expectedTime)
+  })
+
+  test('returns the time in 24 hours format', time => {
+    const timeGiven = "06:48:56PM"
+    const expectedTime = "18:48:56"
+    const actualTime = timeConversions(timeGiven)
+    time.is(actualTime, expectedTime)
+  })