diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e147b7289c6..97d26190c5e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@
 
 - `[jest-cli]` Watch plugins now have access to a broader range of global configuration options in their `updateConfigAndRun` callbacks, so they can provide a wider set of extra features ([#6473](https://github.com/facebook/jest/pull/6473))
 
+### Fixes
+
+- `[pretty-format]` Fix formatting of invalid Date objects ([#6635](https://github.com/facebook/jest/pull/6635))
+
 ## 23.4.0
 
 ### Features
diff --git a/packages/pretty-format/src/__tests__/pretty_format.test.js b/packages/pretty-format/src/__tests__/pretty_format.test.js
index 3e1a1feb7146..b3ec64c760dd 100644
--- a/packages/pretty-format/src/__tests__/pretty_format.test.js
+++ b/packages/pretty-format/src/__tests__/pretty_format.test.js
@@ -234,6 +234,11 @@ describe('prettyFormat()', () => {
     expect(prettyFormat(val)).toEqual('2001-09-09T01:46:40.000Z');
   });
 
+  it('prints an invalid date', () => {
+    const val = new Date(Infinity);
+    expect(prettyFormat(val)).toEqual('Date { NaN }');
+  });
+
   it('prints an empty object', () => {
     const val = {};
     expect(prettyFormat(val)).toEqual('Object {}');
diff --git a/packages/pretty-format/src/index.js b/packages/pretty-format/src/index.js
index aa20f01e3056..1d99da498eec 100644
--- a/packages/pretty-format/src/index.js
+++ b/packages/pretty-format/src/index.js
@@ -146,7 +146,7 @@ function printBasicValue(
     return printSymbol(val);
   }
   if (toStringed === '[object Date]') {
-    return toISOString.call(val);
+    return isNaN(+val) ? 'Date { NaN }' : toISOString.call(val);
   }
   if (toStringed === '[object Error]') {
     return printError(val);