anchor.diff:  ====
   
   ====
  -`compare-and-set!` - TBD (Atomic clocks)
  -[source.code,clojure]
  -----
  -
  -----
  -====
  -
  -====
  -`complement` - Give the inverse intervals. - TBD : better description.
  +`compare-and-set!` - TBD
  +[source.code,clojure]
  +----
  +
  +----
  +====
  +
  +====
  +`complement` - Give the inverse of a list of intervals.
   [source.code,clojure]
   ----
   (t/complement [(t/instant "2010-01-01T00:00")
  
positive.code: ====
  
  ====
  `concurrencies` - A sequence of times when intervals overlap: - TBD Better definition.
  [source.code,clojure]
  ----
  (t/concurrencies (t/today) (t/new-interval (t/today) (t/tomorrow)))
  ----
  ====
  
  ====
  `conj` - TBD
  [source.code,clojure]
  ----
  
  ----
  ====
  
  
negative.code: ----
  (t/new-period 10 :weeks)
  ----
  NOTE: `new period` is in units greater than days. For smaller units,
  see <<new-duration,`new-duration`>>.
  ====
  
  ====
  