Added time utilities.

Core/src/main/java/com/songoda/core/utils/TimeUtils.java

@@ -0,0 +1,58 @@
+package com.songoda.core.utils;
+
+import java.util.concurrent.TimeUnit;
+
+public class TimeUtils {
+
+    public static String makeReadable(Long time) {
+        if (time == null)
+            return "";
+
+        StringBuilder sb = new StringBuilder();
+
+        long days = TimeUnit.MILLISECONDS.toDays(time);
+        long hours = TimeUnit.MILLISECONDS.toHours(time) - TimeUnit.DAYS.toHours(TimeUnit.MILLISECONDS.toDays(time));
+        long minutes = TimeUnit.MILLISECONDS.toMinutes(time) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(time));
+        long seconds = TimeUnit.MILLISECONDS.toSeconds(time) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(time));
+
+        if (days != 0L)
+            sb.append(" ").append(days).append("d");
+        if (hours != 0L)
+            sb.append(" ").append(hours).append("h");
+        if (minutes != 0L)
+            sb.append(" ").append(minutes).append("m");
+        if (seconds != 0L)
+            sb.append(" ").append(seconds).append("s");
+        return sb.toString().trim();
+    }
+
+
+    public static long parseTime(String input) {
+        long result = 0;
+        StringBuilder number = new StringBuilder();
+        for (int i = 0; i < input.length(); i++) {
+            char c = input.charAt(i);
+            if (Character.isDigit(c)) {
+                number.append(c);
+            } else if (Character.isLetter(c) && (number.length() > 0)) {
+                result += convert(Integer.parseInt(number.toString()), c);
+                number = new StringBuilder();
+            }
+        }
+        return result;
+    }
+
+    private static long convert(long value, char unit) {
+        switch (unit) {
+            case 'd':
+                return value * 1000 * 60 * 60 * 24;
+            case 'h':
+                return value * 1000 * 60 * 60;
+            case 'm':
+                return value * 1000 * 60;
+            case 's':
+                return value * 1000;
+        }
+        return 0;
+    }
+}