fix up date formatting change

diff --git a/dygraph.js b/dygraph.js
index ac2bcfd..f5e834f 100644 (file)
--- a/dygraph.js
+++ b/dygraph.js
@@ -193,28 +193,12 @@ Dygraph.numberAxisLabelFormatter = function(x, granularity, opts, g) {
 };
 
 /**
- * Convert a JS date (millis since epoch) to YYYY/MM/DD
- * @param {Number} date The JavaScript date (ms since epoch)
- * @return {String} A date of the form "YYYY/MM/DD"
+ * @type {!Array.<string>}
  * @private
+ * @constant
  */
-Dygraph.dateString_ = function(date) {
-  var zeropad = Dygraph.zeropad;
-  var d = new Date(date);
+Dygraph.SHORT_MONTH_NAMES_ = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
 
-  // Get the year:
-  var year = "" + d.getFullYear();
-  // Get a 0 padded month string
-  var month = zeropad(d.getMonth() + 1);  //months are 0-offset, sigh
-  // Get a 0 padded day string
-  var day = zeropad(d.getDate());
-
-  var ret = "";
-  var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds();
-  if (frac) ret = " " + Dygraph.hmsString_(date);
-
-  return year + "/" + month + "/" + day + ret;
-};
 
 /**
  * Convert a JS date to a string appropriate to display on an axis that
@@ -226,13 +210,15 @@ Dygraph.dateString_ = function(date) {
  */
 Dygraph.dateAxisFormatter = function(date, granularity) {
   if (granularity >= Dygraph.DECADAL) {
-    return date.strftime('%Y');
+    return '' + date.getFullYear();
   } else if (granularity >= Dygraph.MONTHLY) {
-    return date.strftime('%b %y');
+    return Dygraph.SHORT_MONTH_NAMES_[date.getMonth()] + ' ' + date.getFullYear();
   } else {
     var frac = date.getHours() * 3600 + date.getMinutes() * 60 + date.getSeconds() + date.getMilliseconds();
     if (frac === 0 || granularity >= Dygraph.DAILY) {
-      return new Date(date.getTime() + 3600*1000).strftime('%d%b');
+      // e.g. '21Jan' (%d%b)
+      var nd = new Date(date.getTime() + 3600*1000);
+      return Dygraph.zeropad(nd.getDate()) + SHORT_MONTH_NAMES[nd.getMonth()];
     } else {
       return Dygraph.hmsString_(date.getTime());
     }