Datetime header format

Datetime values for the If-Modified-Since and If-Unmodified-Since headers must be in one of these formats:

Format: DDD, dd MMM yyyy hh:mm:ss GMT

Example: Mon, 01 Jan 2013 15:30:00 GMT

The Last-Modified header returned by GET and HEAD requests for objects and versions is in this format.

Format: Day, dd-MMM-yy hh:mm:ss GMT

Example: Monday, 01-Jan-13 15:30:00 GMT

Format: DDD MMM d hh:mm:ss yyyy

Example: Mon Jan 1 15:30:00 2013

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