diff --git a/src/hackerrank/problem-solving/algorithms-011-020.js b/src/hackerrank/problem-solving/algorithms-011-020.js
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+/**
+ * 011: Given a time in 12-hour AM/PM format, convert it to military (24-hour) time.
+ */
+
+/*
+ * Complete the 'timeConversion' function below.
+ *
+ * The function is expected to return a STRING.
+ * The function accepts STRING s as parameter.
+ */
+
+function timeConversion(s) {
+  // get time slice
+  // const [hours, minutes, modifier] = s.split(':');
+  // console.log(hours,minutes,modifier)
+  const time = s.match(/(\d+):(\d+):(\d+)(\w+)/);
+  let hours = time[1];
+  const minutes = time[2];
+  const seconds = time[3];
+  const modifier = time[4];
+
+  if (hours === '12') {
+    hours = '00';
+  }
+
+  if (modifier === 'PM') {
+    hours = parseInt(hours, 10) + 12;
+  }
+
+  return `${hours}:${minutes}:${seconds}`;
+}