[api] remove old timestamp function.

lib/winston/common.js

@@ -181,15 +181,6 @@ exports.hash = function (str) {
   return crypto.createHash('sha1').update(str).digest('hex');
 };
 
-//
-// ## Borrowed from node.js core
-// I wanted a universal lowercase header message, as opposed to the `DEBUG`
-// (i.e. all uppercase header) used only in `util.debug()`
-//
-var months = ['Jan', 'Feb', 'Mar', 'Apr',
-              'May', 'Jun', 'Jul', 'Aug',
-              'Sep', 'Oct', 'Nov', 'Dec'];
-
 //
 // ### function pad (n)
 // Returns a padded string if `n < 10`.
@@ -198,21 +189,6 @@ exports.pad = function (n) {
   return n < 10 ? '0' + n.toString(10) : n.toString(10);
 };
 
-//
-// ### function timestamp ()
-// Returns a timestamp string for the current time.
-//
-exports.timestamp = function () {
-  var d = new Date();
-  var time = [
-    exports.pad(d.getHours()),
-    exports.pad(d.getMinutes()),
-    exports.pad(d.getSeconds())
-  ].join(':');
-
-  return [d.getDate(), months[d.getMonth()], d.getFullYear(), time].join(' ');
-};
-
 //
 // ### function timestamp ()
 // Returns a timestamp string for the current time.