anchor.diff:  PURE ELEMENTAL SUBROUTINE addMinutes(self,m)
   !======================================================================>
   !
  -! datetime-bound procedure. It adds an integer number of minutes to 
  -! self. Called by datetime addition (+) and subtraction (-) operators.
  +! datetime-bound procedure. Adds an integer number of minutes to self. 
  +! Called by datetime addition (+) and subtraction (-) operators.
   !
   !======================================================================>
   
  
positive.code:   REAL(KIND=real_dp)            :: days,totseconds
  
    INTEGER :: year,month,day,hour,minute,second,millisecond
  
    days = num
  
  
negative.code: PURE ELEMENTAL SUBROUTINE addHours(self,h)
  !======================================================================>
  !
  ! datetime-bound procedure. Adds an integer number of hours to self. 
  ! Called by datetime addition (+) and subtraction (-) operators.
  !
  !======================================================================>
  