anchor.diff:  module datetime_tests
     use datetime_module
  -  use, intrinsic :: iso_fortran_env, only: real64
  +  use, intrinsic :: iso_fortran_env, only: int64, real64
   
     implicit none
   
  
positive.code:     a = datetime(1969, 12, 31, 23, 0, 0)
      tests(n) = assert(a % secondsSinceEpoch() == -3600, &
                        'datetime % secondsSinceEpoch(),  -1 hour')
      n = n + 1
  
      print '(71("-"))'
  
negative.code:     print *
  
      ! Test counter; modify if adding new tests
      ntests = 192
  
      call initialize_tests(tests, ntests)
  
  