anchor.diff:  * `duration("P2.5W")` - _2 weeks, 3 days, and 12 hours_
   
   
  +[[current-time]]
   ==== Getting the current temporal instant value
   
   Invoking one of the functions for producing a temporal instant value with no parameter produces a value of the corresponding temporal type representing the current point in time.
  
positive.code: 
      time({timezone:"America/Los Angeles"})
  
  
  [[constructing]]
  ==== Constructing temporal instant values
  
negative.code: If we then further define subtraction on _Date_, _Time_, and _DateTime_ to produce such a single unit duration (with the unit being DAYS for _Date_, and SECONDS for _Time_ and _DateTime_) we would be able to express “is the difference between these two temporal instants shorter than this given duration” in a slightly more intuitive way.
  
  It is questionable if making the type system more complex like this is justified by the small benefit of being able to write such comparisons, especially since the duration in the comparison would be limited to a single time unit.
  