Added colon separated time support

index.js

@@ -7,6 +7,7 @@ var m = s * 60;
 var h = m * 60;
 var d = h * 24;
 var y = d * 365.25;
+var colonOrder = ['h', 'm', 's'];
 
 /**
  * Parse or format the given `val`.
@@ -49,6 +50,14 @@ function parse(str) {
   if (str.length > 100) {
     return;
   }
+  var segments = str.split(':');
+  if (segments.length > 1 && segments.length < 4) {
+    return segments
+      .map(function (t, i) {
+        return parseInt(t) + colonOrder[i]
+      })
+      .join('');
+  }
   var match = /^((?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|years?|yrs?|y)?$/i.exec(
     str
   );

tests.js

@@ -100,6 +100,28 @@ describe('ms(long string)', function() {
   });
 });
 
+// colon separated strings
+
+describe('ms(colon separated string)', function() {
+  it('should not throw an error', function() {
+    expect(function() {
+      ms('07:55');
+    }).to.not.throwError();
+  });
+
+  it('should support hours and minutes', function() {
+    expect(ms('07:55')).to.be('7h55m');
+  });
+
+  it('should support hours, minutes and seconds', function() {
+    expect(ms('07:55:10')).to.be('7h55m10s');
+  });
+
+  it('should remove leading zeros', function() {
+    expect(ms('07:05:05')).to.be('7h5m5s');
+  });
+});
+
 // numbers
 
 describe('ms(number, { long: true })', function() {