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3 michaesp 1 
      PROGRAM datelist
2 
 
3 
c     **********************************************************************
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c     * Handling of date lists                                             *
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c     * Michael Sprenger                                                   *
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c     **********************************************************************
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      implicit none
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10 
c     ---------------------------------------------------------------------
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c     Declaration of variables
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c     ---------------------------------------------------------------------
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c     Parameters
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      character*80              datefile
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      character*80              mode
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      character*80              startdate
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      character*80              finaldate
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      integer                   interval
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c     Date list
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      integer                   ndates
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      integer,allocatable,dimension(:)    :: year,month,day,hour
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c     Auxiliary variables
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      integer                     i
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      integer                     year1,month1,day1,hour1,min1
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      integer                     year2,month2,day2,hour2,min2
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      character                   direction
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      integer                     date1(5),date2(5)
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      character*11                datestr
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      character                   ch
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      real                        diff
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c     ---------------------------------------------------------------------
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c     Preparations
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c     ---------------------------------------------------------------------
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c     Read parameter file
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      open(10,file='datelist.param')
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       read(10,*) datefile                           ! General parameters
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       read(10,*) mode
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       if ( mode.eq.'-create' ) then                 ! Create date list
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          read(10,*) startdate
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          read(10,*) finaldate
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          read(10,*) interval
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       else                                          ! Invalid mode
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          print*,' ERROR: invalid mode for datelist'
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          stop
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       endif
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      close(10)
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c     ---------------------------------------------------------------------
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c     Create a date list (-create)
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c     ---------------------------------------------------------------------
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      if ( mode.ne.'-create' ) goto 100
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c     Check whether interval is ok
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      if ( ( interval.le.0 ).or.(interval.gt.24) ) then
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         print*,'Interval must be between 1 h and 24 h... Stop'
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         stop
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      endif
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c     Extract dates and times
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      read(startdate( 1: 4),*) year1
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      read(startdate( 5: 6),*) month1
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      read(startdate( 7: 8),*) day1
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      read(startdate(10:11),*) hour1
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      read(startdate(12:13),*) min1
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      read(finaldate( 1: 4),*) year2
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      read(finaldate( 5: 6),*) month2
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      read(finaldate( 7: 8),*) day2
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      read(finaldate(10:11),*) hour2
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      read(finaldate(12:13),*) min2
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c     Get direction of the date file
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      if (year2.gt.year1) then
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         direction = 'f'
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         goto 101
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      elseif (year2.lt.year1) then
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         direction = 'b'
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         goto 101
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      endif
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      if (month2.gt.month1) then
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         direction = 'f'
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         goto 101
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      elseif (month2.lt.month1) then
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         direction = 'b'
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         goto 101
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      endif
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      if (day2.gt.day1) then
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         direction = 'f'
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         goto 101
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      elseif (day2.lt.day1) then
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         direction = 'b'
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         goto 101
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      endif
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      if (hour2.gt.hour1) then
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         direction = 'f'
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         goto 101
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      elseif (hour2.lt.hour1) then
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         direction = 'b'
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         goto 101
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      endif
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      if (min2.gt.min1) then
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         direction = 'f'
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         goto 101
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      elseif (min2.lt.min1) then
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         direction = 'b'
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         goto 101
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      endif
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      direction = 'f'
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 101  continue
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c     Set the interval step depending on the direction
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      if ( direction.eq.'b' ) then
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         interval = -interval
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      endif
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c     Save the dates in arrays
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      date1(1) = year1
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      date1(2) = month1
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      date1(3) = day1
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      date1(4) = hour1
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      date1(5) = 0
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      date2(1) = year2
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      date2(2) = month2
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      date2(3) = day2
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      date2(4) = hour2
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      date2(5) = 0
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c     Get starting and ending date for the date list
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      if ( direction.eq.'f' ) then
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         do while ( mod(date1(4),interval) .ne. 0 )
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            date1(4) = date1(4) - 1
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         enddo
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         if (min2.ne.0) call newdate(date2,1.,date2)
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         do while ( mod(date2(4),interval) .ne. 0 )
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            date2(4) = date2(4) + 1
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         enddo
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      else
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         if (min1.ne.0) call newdate(date1,1.,date1)
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         do while ( mod(date1(4),interval) .ne. 0 )
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            date1(4) = date1(4) + 1
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         enddo
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         do while ( mod(date2(4),interval) .ne. 0 )
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            date2(4) = date2(4) - 1
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         enddo
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171 
      endif
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c     Create and write the datefile
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      if ( datefile.ne.'/dev/stdout') then
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         open(10,file=datefile)
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      endif
177 
 
178 
 102  continue
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180 
       call datestring(datestr,date1(1),date1(2),date1(3),date1(4) )
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       if ( datefile.ne.'/dev/stdout') then
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          write(10,*) datestr
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       else
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          write(*,*) datestr
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       endif
187 
 
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       if ( ( date1(1).ne.date2(1) ).or.
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     >      ( date1(2).ne.date2(2) ).or.
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     >      ( date1(3).ne.date2(3) ).or.
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     >      ( date1(4).ne.date2(4) ) )
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     > then
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          diff = real(interval)
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          call newdate(date1,diff,date1)
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          goto 102
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       endif
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      if ( datefile.ne.'/dev/stdout') then
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         close(10)
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      endif
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 100  continue
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c     ---------------------------------------------------------------------
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c     End
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c     ---------------------------------------------------------------------
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209 
      end
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