joyent/node — pull request #2569 by jplock (2012-01-18 02:25:53+00:00)
Title: util.isDate() does not check for invalid Dates

Currently, in Node 0.6.7, this returns true:
```javascript
var util = require('util');
util.isDate(new Date('not a date'));
```

This pull request adds an additional check to isDate() to check if the UNIX timestamp of the Date object is a number.