dcdatetimemin.f90

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! -*- mode: f90; coding: utf-8 -*-
!-----------------------------------------------------------------------
! Copyright (c) 2000-2026 Gtool Development Group. All rights reserved.
!-----------------------------------------------------------------------
!>
!> @author    Yasuhiro MORIKAWA
!> @copyright Copyright (C) GFD Dennou Club, 2000-2026. All rights reserved. <br/>
!>            License is BSD-2-Clause. see [COPYRIGHT](@ref COPYRIGHT) in detail
!> @en
!> @brief User defined function "min"
!> @details
!> This file contains implementation procedures of "min" function
!> for dc_date_types#DC_DATETIME and dc_date_types#DC_DIFFTIME.
!> @enden
!>
!> @ja
!> @brief 利用者定義関数 min
!> @details
!> このファイルには dc_date_types#DC_DATETIME および dc_date_types#DC_DIFFTIME
!> 用の "min" 関数の実装手続きが含まれています。
!> @endja
!>
 
!> @en
!> @brief Return the earlier of two DC_DATETIME values
!> @details
!> Compare two datetime values and return the one that is earlier.
!>
!> @param[in] time1 First datetime to compare
!> @param[in] time2 Second datetime to compare
!> @return The datetime that is earlier
!> @enden
!>
!> @ja
!> @brief 2つの DC_DATETIME 値のうち、より遅れている方を返す
!> @details
!> 2 つの引数の日時を比較し, より日時が遅れている方を返します.
!>
!> @param[in] time1 比較する1番目の日時
!> @param[in] time2 比較する2番目の日時
!> @return より遅れている日時
!> @endja
function dcdatetime_min_tt(time1, time2) result(result)
 
  use dc_date_generic, only: operator(<)
  use dc_date_types, only: dc_datetime, dc_difftime
  implicit none
  type(dc_datetime):: result
  type(dc_datetime), intent(in):: time1, time2
continue
  if ( time1 < time2 ) then
    result = time1
  else
    result = time2
  end if
end function dcdatetime_min_tt
 
!> @en
!> @brief Return the smaller of two DC_DIFFTIME values
!> @details
!> Compare two time difference values and return the smaller one.
!>
!> @param[in] diff1 First time difference to compare
!> @param[in] diff2 Second time difference to compare
!> @return The time difference that is smaller
!> @enden
!>
!> @ja
!> @brief 2つの DC_DIFFTIME 値のうち、より小さい方を返す
!> @details
!> 2 つの引数の日時差を比較し, より小さい方を返します.
!>
!> @param[in] diff1 比較する1番目の日時差
!> @param[in] diff2 比較する2番目の日時差
!> @return より小さい日時差
!> @endja
function dcdatetime_min_ff(diff1, diff2) result(result)
 
  use dc_date_generic, only: operator(<)
  use dc_date_types, only: dc_datetime, dc_difftime
  use dc_date_internal, only: dcdate_nondimcheck
  implicit none
  type(dc_difftime):: result
  type(dc_difftime), intent(in):: diff1, diff2
continue
  if ( diff1 < diff2 ) then
    result = diff1
  else
    result = diff2
  end if
  call dcdate_nondimcheck('dc_date#min', diff1, diff2, result)
end function dcdatetime_min_ff