dccaldatedifference.f90 File Reference

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Functions/Subroutines
real(dp) function	dccaldatedifference1 (start_date, end_date, cal)

Function/Subroutine Documentation

dccaldatedifference1()

real(dp) function dccaldatedifference1	(	type(dc_cal_date), intent(in)	start_date,
		type(dc_cal_date), intent(in)	end_date,
		type(dc_cal), intent(in), optional, target	cal
	)

Definition at line 15 of file dccaldatedifference.f90.

References dc_trace::beginsub(), dc_calendar_types::cal_360day, dc_calendar_types::cal_cyclic, dc_calendar_types::cal_gregorian, dc_calendar_types::cal_julian, dc_calendar_types::cal_noleap, dc_calendar_types::cal_user_defined, dc_error::dc_ebadunit, dc_error::dc_enotinit, dc_error::dc_noerr, dc_calendar_internal::dccaldate_str2usym(), dc_calendar_internal::dccaltype_str(), dc_calendar_internal::default_cal, dc_calendar_internal::default_cal_set(), dc_types::dp, dc_trace::endsub(), dc_error::storeerror(), dc_types::string, dc_types::token, dc_calendar_types::unit_symbol_day, dc_calendar_types::unit_symbol_hour, dc_calendar_types::unit_symbol_min, dc_calendar_types::unit_symbol_month, dc_calendar_types::unit_symbol_sec, and dc_calendar_types::unit_symbol_year.

  !
  ! 日時差を算出します. 
  !
  ! 省略可能引数 *cal* が省略された場合には, 日時差の算出に
  ! dc_calendar 内部で保持される暦が用いられます. 
  ! *cal* が省略されない場合にはその変数に設定された暦が用いられます. 
  !
  ! Evaluate difference of date. 
  !
  ! If an optional argument *cal* is omitted, 
  ! information of calendar that is stored in the "dc_calendar" 
  ! is used for evaluation of difference of date. 
  ! If *cal* is not omitted, information of the variable is used. 
  !

  use dc_calendar_internal, only: default_cal, default_cal_set, &
    & dccaltype_str, dccaldate_str2usym
  use dc_calendar_types, only: dc_cal, dc_cal_date, &
    & unit_symbol_year, unit_symbol_month, unit_symbol_day, &
    & unit_symbol_hour, unit_symbol_min, unit_symbol_sec, &
    & cal_user_defined, &
    & cal_cyclic, cal_noleap, cal_julian, cal_gregorian, cal_360day
  use dc_error, only: storeerror, dc_noerr, dc_ebadunit, dc_enotinit
  use dc_message, only: messagenotify
  use dc_trace, only: beginsub, endsub
  use dc_types, only: dp, token, string
  implicit none
  real(DP):: sec
                              ! *start_date* と *end_date* との差 (秒数). 
                              ! Difference (seconds) between *start_date* and *end_date*.
  type(dc_cal_date), intent(in):: start_date
                              ! 起点となる日時. 
                              ! Date of origin. 
  type(dc_cal_date), intent(in):: end_date
                              ! 終点となる日時. 
                              ! Date of terminus. 
  type(dc_cal), intent(in), optional, target:: cal
                              ! 暦情報を収めたオブジェクト. 
                              ! 
                              ! An object that stores information of 
                              ! calendar. 

  ! 作業変数
  ! Work variables
  !
  type(dc_cal), pointer:: calp =>null()
  real(DP):: start_year, start_day, start_sec, start_neg_offset_day
  real(DP)::   end_year,   end_day,   end_sec,   end_neg_offset_day
  integer:: day_in_4years, day_in_400years
  integer:: start_year_int, end_year_int
  integer:: i, j
  character(*), parameter:: subname = 'DCCalDateDifference1'
continue
  ! オブジェクトのポインタ割付
  ! Associate pointer of an object
  !
  if ( present( cal ) ) then
    calp => cal
  else
    calp => default_cal
    if ( .not. calp % initialized ) call default_cal_set
  end if

  ! 初期設定のチェック
  ! Check initialization
  !
  if ( .not. calp % initialized ) then
    sec = 0.0_dp
    return
  end if

  if ( .not. start_date % initialized ) then
    sec = 0.0_dp
    return
  end if

  if ( .not. end_date % initialized ) then
    sec = 0.0_dp
    return
  end if

  start_neg_offset_day = 0
  end_neg_offset_day   = 0

  start_year_int = start_date % year
  end_year_int   = end_date % year

  ! 日への変換
  ! Convert into days
  ! 
  select case( calp % cal_type )
  case( cal_julian )

    day_in_4years = 1461

    ! 年が負の場合，400 年単位で引き算し下駄を履かせる
    !
    do while ( start_year_int < 1 )
      start_neg_offset_day =   start_neg_offset_day &
        &                    + day_in_4years * 100
      start_year_int       =   start_year_int &
        &                    + 400
    end do

    ! start_date の日への変換
    ! Convert start_date into days
    ! 
    if ( ( start_year_int - 1 ) > 4 ) then
      start_day = int( ( start_year_int - 1 ) / 4 ) * day_in_4years
      start_year = mod( start_year_int - 1, 4 ) + 1
    else
      start_day  = 0
      start_year = start_year_int
    end if

    start_day = start_day + ( start_year - 1 ) * sum( calp % day_in_month(:) )
    do i = 1, start_date % month - 1
      if ( start_year == 4 .and. i == 2 ) then
        start_day = start_day + 29
      else
        start_day = start_day + calp % day_in_month(i)
      end if
    end do
    start_day = start_day + start_date % day

    ! 年が負の場合，400 年単位で引き算し下駄を履かせる
    !
    do while ( end_year_int < 1 )
      end_neg_offset_day =   end_neg_offset_day &
        &                  + day_in_4years * 100
      end_year_int       =   end_year_int &
        &                  + 400
    end do

    ! end_date の日への変換
    ! Convert end_date into days
    ! 
    if ( ( end_year_int - 1 ) > 4 ) then
      end_day = int( ( end_year_int - 1 ) / 4 ) * day_in_4years
      end_year = mod( end_year_int - 1, 4 ) + 1
    else
      end_day  = 0
      end_year = end_year_int
    end if

    end_day = end_day + ( end_year - 1 ) * sum ( calp % day_in_month(:) )
    do i = 1, end_date % month - 1
      if ( end_year == 4 .and. i == 2 ) then
        end_day = end_day + 29
      else
        end_day = end_day + calp % day_in_month(i)
      end if
    end do
    end_day = end_day + end_date % day

  case( cal_gregorian )

    day_in_400years = 146097

    ! 年が負の場合，400 年単位で引き算し下駄を履かせる
    !
    do while ( start_year_int < 1 )
      start_neg_offset_day =   start_neg_offset_day &
        &                    + day_in_400years
      start_year_int       =   start_year_int &
        &                    + 400
    end do

    ! start_date の日への変換
    ! Convert start_date into days
    ! 
    if ( ( start_year_int - 1 ) > 400 ) then
      start_day = int( ( start_year_int - 1 ) / 400 ) * day_in_400years
      start_year = mod( start_year_int - 1, 400 ) + 1
    else
      start_day  = 0
      start_year = start_year_int
    end if

    do j = 1, int( start_year - 1 )
      do i = 1, calp % month_in_year
        if ( i == 2 ) then
          if     ( mod( j, 400 ) == 0 ) then
            start_day = start_day + 29
          elseif ( mod( j, 100 ) == 0 ) then
            start_day = start_day + 28
          elseif ( mod( j, 4   ) == 0 ) then
            start_day = start_day + 29
          else
            start_day = start_day + 28
          end if
        else
          start_day = start_day + calp % day_in_month(i)
        end if
      end do
    end do

    do i = 1, start_date % month - 1
      if ( i == 2 ) then
        if     ( mod( start_year, 400.0_dp ) == 0 ) then
          start_day = start_day + 29
        elseif ( mod( start_year, 100.0_dp ) == 0 ) then
          start_day = start_day + 28
        elseif ( mod( start_year, 4.0_dp   ) == 0 ) then
          start_day = start_day + 29
        else
          start_day = start_day + 28
        end if
      else
        start_day = start_day + calp % day_in_month(i)
      end if
    end do

    start_day = start_day + start_date % day

    ! 年が負の場合，400 年単位で引き算し下駄を履かせる
    !
    do while ( end_year_int < 1 )
      end_neg_offset_day =   end_neg_offset_day &
        &                  + day_in_400years
      end_year_int       =   end_year_int &
        &                  + 400
    end do

    ! end_date の日への変換
    ! Convert end_date into days
    ! 
    if ( ( end_year_int - 1 ) > 400 ) then
      end_day = int( ( end_year_int - 1 ) / 400 ) * day_in_400years
      end_year = mod( end_year_int - 1, 400 ) + 1
    else
      end_day  = 0
      end_year = end_year_int
    end if

    do j = 1, int( end_year - 1 )
      do i = 1, calp % month_in_year
        if ( i == 2 ) then
          if     ( mod( j, 400 ) == 0 ) then
            end_day = end_day + 29
          elseif ( mod( j, 100 ) == 0 ) then
            end_day = end_day + 28
          elseif ( mod( j, 4   ) == 0 ) then
            end_day = end_day + 29
          else
            end_day = end_day + 28
          end if
        else
          end_day = end_day + calp % day_in_month(i)
        end if
      end do
    end do

    do i = 1, end_date % month - 1
      if ( i == 2 ) then
        if     ( mod( end_year, 400.0_dp ) == 0 ) then
          end_day = end_day + 29
        elseif ( mod( end_year, 100.0_dp ) == 0 ) then
          end_day = end_day + 28
        elseif ( mod( end_year, 4.0_dp   ) == 0 ) then
          end_day = end_day + 29
        else
          end_day = end_day + 28
        end if
      else
        end_day = end_day + calp % day_in_month(i)
      end if
    end do

    end_day = end_day + end_date % day

  case default
    ! start_date の日への変換
    ! Convert start_date into days
    ! 
    start_day = ( start_year_int - 1 ) * sum( calp % day_in_month(:) )
    do i = 1, start_date % month - 1
      start_day = start_day + calp % day_in_month(i)
    end do
    start_day = start_day + start_date % day

    ! end_date の日への変換
    ! Convert end_date into days
    ! 
    end_day = ( end_year_int - 1 ) * sum ( calp % day_in_month(:) )
    do i = 1, end_date % month - 1
      end_day = end_day + calp % day_in_month(i)
    end do
    end_day = end_day + end_date % day
  end select

  ! start_date の秒への変換
  ! Convert start_date into seconds
  ! 
  start_sec =   ( start_day - 1 - start_neg_offset_day ) &
      &                           * calp % hour_in_day &
      &                           * calp % min_in_hour &
      &                           * calp % sec_in_min  &
      &       + start_date % hour * calp % min_in_hour &
      &                           * calp % sec_in_min  &
      &       + start_date % min  * calp % sec_in_min  &
      &       + start_date % sec

  ! end_date の秒への変換
  ! Convert end_date into seconds
  ! 
  end_sec =   ( end_day - 1 - end_neg_offset_day ) &
      &                       * calp % hour_in_day &
      &                       * calp % min_in_hour &
      &                       * calp % sec_in_min  &
      &     + end_date % hour * calp % min_in_hour &
      &                       * calp % sec_in_min  &
      &     + end_date % min  * calp % sec_in_min  &
      &     + end_date % sec

  ! 差分の計算
  ! Calculate difference
  !
  sec = end_sec - start_sec

  ! 終了処理, 例外処理
  ! Termination and Exception handling
  !
999 continue
  nullify( calp )

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