anchor.diff:  
     ! Test counter; 
     ! modify if adding new tests
  -  ntests = 169
  +  ntests = 171
   
     CALL initialize_tests(tests,ntests)
   
  
positive.code: 
    USE iso_c_binding
  
    TYPE(datetime)  :: a
    TYPE(timedelta) :: td
    TYPE(clock)     :: c
  
  
negative.code:   n = n+1
  
    a = datetime(2014,1,1,0,0,0,tz=6)
    b = a-timedelta(hours=6)
    b % tz = 0
    tests(n) = assert(a % utc() == b,'datetime % utc(), +0600')
    n = n+1
  
    a = datetime(2014,1,1,0,0,0,tz=-6)
    b = a+timedelta(hours=6)
    b % tz = 0
    tests(n) = assert(a % utc() == b,'datetime % utc(), -0600')
    n = n+1
    !---------------------------------------------------------------------
  
  