Comment by rosser

Quibble: the "now()" function doesn't return the time of statement start; it returns the time of transaction start.

  $ psql -q
  rosser=# begin;
  rosser=# select now();
                now              
  -------------------------------
   2015-09-11 02:28:54.262142-07
  (1 row)
  
  rosser=# select now();
                now              
  -------------------------------
   2015-09-11 02:28:54.262142-07
  (1 row)