anchor.diff:  
   * `_character-expression_`
   +
  -is an expression that gives a character value.
  +is an expression that gives a character value. The expression ia assumed to have the format YYYY-MM-DD HH:MI:SS[.FFFFFFF],
  +where YYYY is a 4-digit year, MM is a 2-digit month, DD is a 2-digit day, HH is a 2-digit hours field, MI is a 2-digit
  +minutes field, SS is a two-digit seconds field and FFFFFF is an optional microseconds field.
   
   [[examples_of_to_timestamp]]
   === Example of TO_TIMESTAMP
  
positive.code: ** 'MONTH DD, YYYY, HH:MI'
  ** 'DD.MM.YYYY HH24.MI.SS'
  
  [[considerations_for_to_time]]
  === Considerations for TO_TIME
  
  
negative.code: ** 'DD-MON-YYYY'
  ** 'DDMONYYYY'
  
  Here, YYYY refers to a 4-digit year. YY refers to a two-digit year. MM refers to a two-digit month. MON refers to
  a three-letter abbreviation for month ('JAN', 'FEB', 'MAR', 'APR', 'MAY', 'JUN', 'JUL', 'AUG', 'SEP',
  'OCT', 'NOV' or 'DEC'). The month may be given in lower case, upper case or any mixture.
  
  If the _format-string_ argument is omitted, 'YYYY-MM-DD' is used as the
  default.
  
  