anchor.diff:  
   
   
  +PURE ELEMENTAL CHARACTER(LEN=5) FUNCTION tzOffset(self)
  +!======================================================================>
  +!
  +! Returns a character string with timezone offset in hours from UTC,
  +! in format +/-[hh][mm].
  +!
  +!======================================================================>
  +
  +  ! ARGUMENTS:
  +  CLASS(datetime),INTENT(IN) :: self
  +
  +  INTEGER :: hours,minutes
  +
  +  IF(self%tz < 0)THEN
  +    tzOffset(1:1) = '-'
  +  ELSE
  +    tzOffset(1:1) = '+'
  +  ENDIF
  +
  +  hours   = INT(ABS(self%tz))
  +  minutes = NINT((ABS(self%tz)-hours)*60)
  +
  +  IF(minutes == 60)THEN
  +    minutes = 0
  +    hours = hours+1
  +  ENDIF
  +
  +  WRITE(UNIT=tzOffset(2:5),FMT='(2I2.2)')hours,minutes
  +
  +ENDFUNCTION tzOffset
  +!======================================================================>
  +
  +
  +
  +PURE ELEMENTAL TYPE(datetime) FUNCTION utc(self)
  +!======================================================================>
  +!
  +! Returns the datetime instance at Centralized Universal Time (UTC). 
  +!
  +!======================================================================>
  +
  +  ! ARGUMENTS:
  +  CLASS(datetime),INTENT(IN) :: self
  +
  +  INTEGER :: hours,minutes,sgn
  +
  +  hours   = INT(ABS(self%tz))
  +  minutes = NINT((ABS(self%tz)-hours)*60)
  +  sgn     = INT(self%tz/ABS(self%tz))
  +
  +  utc = self-timedelta(hours=sgn*hours,minutes=sgn*minutes)
  +  utc%tz = 0
  +
  +ENDFUNCTION utc
  +!======================================================================>
  +
  +
  +
   PURE ELEMENTAL INTEGER FUNCTION yearday(self)
   !======================================================================>
   !
  
positive.code:     CHARACTER(KIND=c_char),DIMENSION(*),INTENT(IN)  :: str
      CHARACTER(KIND=c_char),DIMENSION(*),INTENT(IN)  :: format
      TYPE(tm_struct),                    INTENT(OUT) :: tm
      INTEGER(KIND=c_int)                             :: rc
  
    ENDFUNCTION strptime
    !====================================================================>
  
negative.code: !         PROCEDURE :: now
  !         PROCEDURE :: secondsSinceEpoch
  !         PROCEDURE :: tm
  !         PROCEDURE :: tzOffset
  !         PROCEDURE :: utc
  !         PROCEDURE :: weekday
  !         PROCEDURE :: weekdayShort
  !         PROCEDURE :: weekdayLong
  