diff --git a/lib/xlsx/xform/simple/date-xform.js b/lib/xlsx/xform/simple/date-xform.js
index e64c096d9..331e759a7 100644
--- a/lib/xlsx/xform/simple/date-xform.js
+++ b/lib/xlsx/xform/simple/date-xform.js
@@ -13,8 +13,9 @@ var DateXform = module.exports = function(options) {
this.tag = options.tag;
this.attr = options.attr;
this.attrs = options.attrs;
- this._format = options.format || function (dt) {
+ this._format = options.format || function (dt) {
try {
+ if (isNaN(dt.getTime())) return '';
return dt.toISOString();
} catch(e) {
return '';
diff --git a/spec/unit/xlsx/xform/simple/date-xform.spec.js b/spec/unit/xlsx/xform/simple/date-xform.spec.js
index 55dd3c262..11baba41c 100644
--- a/spec/unit/xlsx/xform/simple/date-xform.spec.js
+++ b/spec/unit/xlsx/xform/simple/date-xform.spec.js
@@ -33,7 +33,16 @@ var expectations = [
preparedModel: undefined,
xml: '',
tests: ['render', 'renderIn']
+ },
+ {
+ title: 'invalid date',
+ create: function() { return new DateXform({tag: 'date', attr: undefined}); },
+ preparedModel: new Date(undefined),
+ xml: '',
+ tests: ['render']
}
+
+
];
describe('DateXform', function() {
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