Merge branch 'fix-time-format-bc-year' into 3.2

d3.js

@@ -8207,9 +8207,8 @@ d3 = function() {
     return map;
   }
   function d3_time_formatPad(value, fill, width) {
-    value += "";
-    var length = value.length;
-    return length < width ? new Array(width - length + 1).join(fill) + value : value;
+    var sign = value < 0 ? "-" : "", string = (sign ? -value : value) + "", length = string.length;
+    return sign + (length < width ? new Array(width - length + 1).join(fill) + string : string);
   }
   var d3_time_dayRe = d3_time_formatRe(d3_time_days), d3_time_dayAbbrevRe = d3_time_formatRe(d3_time_dayAbbreviations), d3_time_monthRe = d3_time_formatRe(d3_time_months), d3_time_monthLookup = d3_time_formatLookup(d3_time_months), d3_time_monthAbbrevRe = d3_time_formatRe(d3_time_monthAbbreviations), d3_time_monthAbbrevLookup = d3_time_formatLookup(d3_time_monthAbbreviations);
   var d3_time_formatPads = {

src/time/format.js

@@ -79,9 +79,10 @@ function d3_time_formatLookup(names) {
 }
 
 function d3_time_formatPad(value, fill, width) {
-  value += "";
-  var length = value.length;
-  return length < width ? new Array(width - length + 1).join(fill) + value : value;
+  var sign = value < 0 ? "-" : "",
+      string = (sign ? -value : value) + "",
+      length = string.length;
+  return sign + (length < width ? new Array(width - length + 1).join(fill) + string : string);
 }
 
 var d3_time_dayRe = d3_time_formatRe(d3_time_days),

test/time/format-test.js

@@ -142,6 +142,7 @@ suite.addBatch({
       var f = format("%y");
       assert.equal(f(local(1990, 0, 1)), "90");
       assert.equal(f(local(2002, 0, 1)), "02");
+      assert.equal(f(local(-2, 0, 1)), "-02");
     },
     "formats zero-padded four-digit year": function(format) {
       var f = format("%Y");
@@ -149,6 +150,7 @@ suite.addBatch({
       assert.equal(f(local(1990, 0, 1)), "1990");
       assert.equal(f(local(2002, 0, 1)), "2002");
       assert.equal(f(local(10002, 0, 1)), "0002");
+      assert.equal(f(local(-2, 0, 1)), "-0002");
     },
     "formats time zone": function(format) {
       var f = format("%Z");