--- /dev/null
+<?php
+
+/*
+ * This file is part of the Behat Testwork.
+ * (c) Konstantin Kudryashov <ever.zet@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Behat\Testwork\Counter;
+
+use Behat\Testwork\Counter\Exception\TimerException;
+
+/**
+ * Provides time counting functionality.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+final class Timer
+{
+ /**
+ * @var null|float
+ */
+ private $starTime;
+ /**
+ * @var null|float
+ */
+ private $stopTime;
+
+ /**
+ * Starts timer.
+ */
+ public function start()
+ {
+ $this->starTime = microtime(true);
+ }
+
+ /**
+ * Stops timer.
+ *
+ * @throws TimerException If timer has not been started
+ */
+ public function stop()
+ {
+ if (!$this->starTime) {
+ throw new TimerException('You can not stop timer that has not been started.');
+ }
+
+ $this->stopTime = microtime(true);
+ }
+
+ /**
+ * @return null|float
+ *
+ * @throws TimerException If timer has not been started
+ */
+ public function getTime()
+ {
+ if (!$this->starTime) {
+ throw new TimerException('You can not get time from timer that never been started.');
+ }
+
+ $stopTime = $this->stopTime;
+ if (!$this->stopTime) {
+ $stopTime = microtime(true);
+ }
+
+ return $stopTime - $this->starTime;
+ }
+
+ /**
+ * Returns number of minutes passed.
+ *
+ * @return integer
+ */
+ public function getMinutes()
+ {
+ return intval(floor($this->getTime() / 60));
+ }
+
+ /**
+ * Returns number of seconds passed.
+ *
+ * @return float
+ */
+ public function getSeconds()
+ {
+ return round($this->getTime() - ($this->getMinutes() * 60), 3);
+ }
+
+ /**
+ * Returns string representation of time passed.
+ *
+ * @return string
+ */
+ public function __toString()
+ {
+ if (!$this->starTime || !$this->stopTime) {
+ return '0m0s';
+ }
+
+ return sprintf('%dm%.2fs', $this->getMinutes(), $this->getSeconds());
+ }
+}