JavaScriptCollection
diff --git a/‎d3.v2.js‎
Lines changed: 1 addition & 1 deletion b/‎d3.v2.js‎
Lines changed: 1 addition & 1 deletion
diff --git a/‎d3.v2.min.js‎
Lines changed: 3 additions & 3 deletions b/‎d3.v2.min.js‎
Lines changed: 3 additions & 3 deletions
diff --git a/‎src/core/format.js‎
Lines changed: 1 addition & 1 deletion b/‎src/core/format.js‎
Lines changed: 1 addition & 1 deletion
diff --git a/‎test/core/format-test.js‎
Lines changed: 14 additions & 0 deletions b/‎test/core/format-test.js‎
Lines changed: 14 additions & 0 deletions
@@ -566,7 +566,7 @@
     var zcomma = zfill && comma;
     return function(value) {
       if (integer && value % 1) return "";
-      var negative = value < 0 && (value = -value) ? "-" : sign;
+      var negative = value < 0 || value === 0 && 1 / value < 0 ? (value = -value, "-") : sign;
       if (scale < 0) {
         var prefix = d3.formatPrefix(value, precision);
         value = prefix.scale(value);
 
@@ -49,7 +49,7 @@ d3.format = function(specifier) {
     if (integer && (value % 1)) return "";
 
     // Convert negative to positive, and record the sign prefix.
-    var negative = value < 0 && (value = -value) ? "-" : sign;
+    var negative = value < 0 || value === 0 && 1 / value < 0 ? (value = -value, "-") : sign;
 
     // Apply the scale, computing it from the value's exponent for si format.
     if (scale < 0) {
 
@@ -291,6 +291,20 @@ suite.addBatch({
       assert.strictEqual(format("=+13,d")(0), "+           0");
       assert.strictEqual(format("=+21,d")(0), "+                   0");
     },
+    "a space can denote positive numbers": function(format) {
+      assert.strictEqual(format(" 1,d")(-1), "-1");
+      assert.strictEqual(format(" 1,d")(0), " 0");
+      assert.strictEqual(format(" 2,d")(0), " 0");
+      assert.strictEqual(format(" 3,d")(0), "  0");
+      assert.strictEqual(format(" 5,d")(0), "    0");
+      assert.strictEqual(format(" 8,d")(0), "       0");
+      assert.strictEqual(format(" 13,d")(0), "            0");
+      assert.strictEqual(format(" 21,d")(0), "                    0");
+    },
+    "can format negative zero": function(format) {
+      assert.strictEqual(format("1d")(-0), "-0");
+      assert.strictEqual(format("1f")(-0), "-0");
+    },
     "supports \"n\" as an alias for \",g\"": function(format) {
       var f = format("n");
       assert.strictEqual(f(.0042), "0.0042");