util: fix invalid date output with util.inspect

Prevent util.inspect of throwing on date object with invalid date value.
It changed to output result of toString method call.
PR-URL: #6504
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: rumkin

lib/util.js

@@ -348,7 +348,11 @@ function formatValue(ctx, value, recurseTimes) {
 returnctx.stylize(RegExp.prototype.toString.call(value),'regexp');
 }
 if(isDate(value)){
-returnctx.stylize(Date.prototype.toISOString.call(value),'date');
+if(Number.isNaN(value.getTime())){
+returnctx.stylize(value.toString(),'date');
+}else{
+returnctx.stylize(Date.prototype.toISOString.call(value),'date');
+}
 }
 if(isError(value)){
 returnformatError(value);

test/parallel/test-util-inspect.js

@@ -12,8 +12,9 @@ assert.equal(util.inspect(function() {}), '[Function]');
 assert.equal(util.inspect(undefined),'undefined');
 assert.equal(util.inspect(null),'null');
 assert.equal(util.inspect(/foo(bar\n)?/gi),'/foo(bar\\n)?/gi');
-assert.equal(util.inspect(newDate('Sun, 14 Feb 2010 11:48:40 GMT')),
+assert.strictEqual(util.inspect(newDate('Sun, 14 Feb 2010 11:48:40 GMT')),
 newDate('2010-02-14T12:48:40+01:00').toISOString());
+assert.strictEqual(util.inspect(newDate('')),(newDate('')).toString());
 
 assert.equal(util.inspect('\n\u0001'),"'\\n\\u0001'");