--- /dev/null
+define(['../math/countSteps', '../number/pad'], function(countSteps, pad){
+
+ var HOUR = 3600000,
+ MINUTE = 60000,
+ SECOND = 1000;
+
+ /**
+ * Format timestamp into a time string.
+ */
+ function toTimeString(ms){
+ var h = ms < HOUR ? 0 : countSteps(ms, HOUR),
+ m = ms < MINUTE ? 0 : countSteps(ms, MINUTE, 60),
+ s = ms < SECOND ? 0 : countSteps(ms, SECOND, 60),
+ str = '';
+
+ str += h? h + ':' : '';
+ str += pad(m, 2) + ':';
+ str += pad(s, 2);
+
+ return str;
+ }
+ return toTimeString;
+});