Single quote escaping isn't supported

[mikedemers]

Formats should allow quoting as documented at http://download.oracle.com/javase/1.4.2/docs/api/java/text/SimpleDateFormat.html:

Text can be quoted using single quotes (') to avoid interpretation. "''" represents a single quote.

Format strings such as "MMM d, yyyy 'at' h:mm a" aren't being handled properly.