diff --git a/src/Core/Scripts/Runtime/Format.js b/src/Core/Scripts/Runtime/Format.js
index fddce5620..e177a0ece 100644
--- a/src/Core/Scripts/Runtime/Format.js
+++ b/src/Core/Scripts/Runtime/Format.js
@@ -8,7 +8,7 @@ function _commaFormatNumber(number, groups, decimal, comma) {
     number = number.substr(0, decimalIndex);
   }
 
-  var negative = number.startsWith('-');
+  var negative = ss.startsWith(number, '-');
   if (negative) {
     number = number.substr(1);
   }
@@ -16,6 +16,9 @@ function _commaFormatNumber(number, groups, decimal, comma) {
   var groupIndex = 0;
   var groupSize = groups[groupIndex];
   if (number.length < groupSize) {
+    if (negative) {
+      number = '-' + number;
+    }
     return decimalPart ? number + decimalPart : number;
   }
 
@@ -72,7 +75,7 @@ _formatters['Number'] = function(number, format, culture) {
       if (precision != -1) {
         s = padLeft(s, precision, '0');
       }
-      if (number < 0) {
+      if (number < 0 && s != 0) {
         s = '-' + s;
       }
       break;
@@ -92,6 +95,10 @@ _formatters['Number'] = function(number, format, culture) {
       else {
         s = number.toExponential(precision);
       }
+      if (nf.ds != '.') {
+        var index = s.indexOf('.');
+        s = s.substr(0, index) + nf.ds + s.substr(index + 1);
+      }
       if (fs == 'E') {
         s = s.toUpperCase();
       }
@@ -101,7 +108,7 @@ _formatters['Number'] = function(number, format, culture) {
       if (precision == -1) {
         precision = nf.dd;
       }
-      s = number.toFixed(precision).toString();
+      s = (+(Math.round(+(number + 'e' + precision)) + 'e' + -precision)).toFixed(precision);
       if (precision && (nf.ds != '.')) {
         var index = s.indexOf('.');
         s = s.substr(0, index) + nf.ds + s.substr(index + 1);
@@ -121,10 +128,10 @@ _formatters['Number'] = function(number, format, culture) {
       }
       s = _commaFormatNumber(s, nf.curGW, nf.curDS, nf.curGS);
       if (number < 0) {
-        s = String.format(culture, nf.curNP, s);
+        s = ss.format(culture, nf.curNP, s);
       }
       else {
-        s = String.format(culture, nf.curPP, s);
+        s = ss.format(culture, nf.curPP, s);
       }
       break;
     case 'p': case 'P':
@@ -138,10 +145,10 @@ _formatters['Number'] = function(number, format, culture) {
       }
       s = _commaFormatNumber(s, nf.perGW, nf.perDS, nf.perGS);
       if (number < 0) {
-        s = String.format(culture, nf.perNP, s);
+        s = ss.format(culture, nf.perNP, s);
       }
       else {
-        s = String.format(culture, nf.perPP, s);
+        s = ss.format(culture, nf.perPP, s);
       }
       break;
   }
diff --git a/src/Core/Scripts/Runtime/Misc.js b/src/Core/Scripts/Runtime/Misc.js
index 9275e4d8b..da6855f5a 100644
--- a/src/Core/Scripts/Runtime/Misc.js
+++ b/src/Core/Scripts/Runtime/Misc.js
@@ -47,6 +47,12 @@ function parseNumber(s) {
   if (!s || !s.length) {
     return 0;
   }
+
+  if (ss.culture.current.nf.gs.length)
+    s = s.replace(new RegExp('\\' + ss.culture.current.nf.gs, 'g'), '');
+  if (ss.culture.current.nf.ds.length)
+    s = s.replace(new RegExp('\\' + ss.culture.current.nf.ds), '.');
+
   if ((s.indexOf('.') >= 0) || (s.indexOf('e') >= 0) ||
       endsWith(s, 'f') || endsWith(s, 'F')) {
     return parseFloat(s);