Here's how to add pubDate and guid fields to your RSS output from JSON input. -- http://pipes.tumblr.com/post/32331202

Demonstrates how to use the "Relative Time" pipe/module [ http://pipes.yahoo.com/plumber/reltime ]. By default, this demo shows how long it has been since that module was published. -- http://pipes.tumblr.com/post/32192166

Converts a date/time string to relative time, e.g. "less than a minute ago", "about 3 hours ago", "about 26 days from now", etc. from minutes to years. This is meant to be cloned and used as an external pipe module, so you won't see anything below if you run this.…

Modifies your Tumblr feed so that tags are appended to the title. -- http://pipes.tumblr.com/post/32152064

You can use the contents of fields in your regex replacements; just use the ${fieldname} pattern. This works even if you use it inside a String Builder. In this demo, notice how the publication date becomes part of the title. -- http://pipes.tumblr.com/post/32153703

A counter (for loop) similar to Mauricio Scheffer's but using an internal string for the number source. Also limited to 1000 loops but you can just add more numbers. -- http://pipes.tumblr.com/post/31708799

Turns feed descriptions (excerpts) on or off via a parameter. Useful for widgets/badges. -- http://pipes.tumblr.com/post/31706745