text: /* 1991-10-14 (cc) <paul4hough@gmail.com>
   * compares tm structs, returns the diff in seconds
   */
  
  #include "datetime.h"
  
  time_t Difftm(struct tm *t1, struct tm *t2)
  {
    return( mktime(t1) - mktime(t2) );
  }
  