dcdatetimelt.f90

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! -*- mode: f90; coding: utf-8 -*-
!-----------------------------------------------------------------------
! Copyright (c) 2000-2026 Gtool Development Group. All rights reserved.
!-----------------------------------------------------------------------
 
logical function dcdatetime_lt_tt(time1, time2) result(result)
 
  use dc_date_generic, only: eval, evalsclsec, zonetodiff
  use dc_date_types, only: dc_datetime, dc_difftime
  use dc_scaledsec, only: dc_scaled_sec, &
    & operator(==), operator(<), operator(>), operator(<=), operator(>=), &
    & operator(+)
  implicit none
  type(dc_datetime), intent(in):: time1, time2
  type(dc_scaled_sec):: year1, year2, time1_sec, time2_sec
continue
  call eval(time1, sclyear=year1)
  call eval(time2, sclyear=year2)
  if (year1 < year2) then
    result = .true.
  elseif (year1 > year2) then
    result = .false.
  else
    time1_sec = evalsclsec(time1) + evalsclsec(zonetodiff(time1 % zone))
    time2_sec = evalsclsec(time2) + evalsclsec(zonetodiff(time2 % zone))
    if (time1_sec < time2_sec) then
      result = .true.
    else
      result = .false.
    end if
  end if
end function dcdatetime_lt_tt
 
logical function dcdatetime_lt_ff(diff1, diff2) result(result)
 
  use dc_date_generic, only: evalsec
  use dc_date_types, only: dc_datetime, dc_difftime
  use dc_scaledsec, only: &
    & operator(<), operator(>), operator(<=), operator(>=), operator(==)
  implicit none
  type(dc_difftime), intent(in):: diff1, diff2
continue
  if ( diff1 % day_seconds == diff2 % day_seconds ) then
 
    if ( diff1 % mon < diff2 % mon ) then
      result = .true.  ; return
    elseif ( diff1 % mon > diff2 % mon ) then
      result = .false. ; return
    end if
    if ( diff1 % day < diff2 % day ) then
      result = .true.  ; return
    elseif ( diff1 % day > diff2 % day ) then
      result = .false. ; return
    end if
    if ( diff1 % sec < diff2 % sec ) then
      result = .true.  ; return
    elseif ( diff1 % sec > diff2 % sec ) then
      result = .false. ; return
    end if
    result = .false.
  else
 
    if (evalsec(diff1) < evalsec(diff2)) then
      result = .true.
    else
      result = .false.
    end if
  end if
 
end function dcdatetime_lt_ff
 
logical function dcdatetime_lt_fi(diff, factor) result(result)
 
  use dc_date_generic, only: evalsec
  use dc_date_types, only: dc_datetime, dc_difftime
  implicit none
  type(dc_difftime), intent(in):: diff
  integer, intent(in):: factor
continue
  result = evalsec(diff) < factor
end function dcdatetime_lt_fi
 
logical function dcdatetime_lt_if(factor, diff) result(result)
 
  use dc_date_generic, only: evalsec
  use dc_date_types, only: dc_datetime, dc_difftime
  implicit none
  integer, intent(in):: factor
  type(dc_difftime), intent(in):: diff
continue
  result = factor < evalsec(diff)
end function dcdatetime_lt_if