dcdatetimetochar.f90

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! -*- mode: f90; coding: utf-8 -*-
!-----------------------------------------------------------------------
! Copyright (c) 2000-2026 Gtool Development Group. All rights reserved.
!-----------------------------------------------------------------------
 
function dcdatetimetochar(time) result(result)
 
  use dc_types, only: string, token, dp
  use dc_string, only: tochar, cprintf, stoa
  use dc_date_generic, only: eval
  use dc_date_types, only: dc_datetime
  use dc_message, only: messagenotify
  implicit none
  character(STRING):: result
  type(dc_datetime), intent(in):: time
 
  integer :: year, mon, day, hour, min, csec_len
  real(dp):: sec
  character(TOKEN) :: zone
  character(STRING) :: csec
continue
 
  call eval(time, &
    & year=year, mon=mon, day=day, hour=hour, min=min, sec=sec, zone=zone)
 
  csec = tochar(sec)
  if ( trim(csec) == '-0.' ) csec = '0.'
  do while ( index('123456789.', csec(len_trim(csec):len_trim(csec)) ) == 0 )
    if ( len_trim(csec) < 2 ) exit
    csec = csec(1:len_trim(csec)-1)
  end do
  if (int(sec) > -1 .and. int(sec) < 10) then
    if (len_trim(csec) >= len(csec)) then
      csec = '0' // trim(csec(1:len(csec) - 1))
    else
      csec = '0' // trim(csec)
    end if
  end if
  csec_len = len(trim(adjustl(csec)))
  if (csec(csec_len:csec_len) == '.') csec = csec(1:csec_len-1)
 
  result = cprintf('%04d-%02d-%02dT%02d:%02d:%c%c', &
    & i=(/year, mon, day, hour, min/), &
    & c1=trim(csec), c2=trim(zone))
 
end function dcdatetimetochar
 
 
function dcdifftimetochar(diff) result(result)
 
  use dc_types, only: string, dp
  use dc_string, only: tochar, cprintf, stoa
  use dc_date_generic, only: eval
  use dc_date_types, only: dc_difftime
  use dc_scaledsec, only: assignment(=)
  implicit none
  character(STRING):: result
  type(dc_difftime), intent(in):: diff
 
  integer :: year, mon, day, hour, min, csec_len
  real(dp):: sec
  character(STRING) :: csec
  character(1) :: pm
continue
 
  if ( .not. diff % nondim_flag ) then
    call eval(diff, year=year, mon=mon, day=day, hour=hour, min=min, sec=sec)
 
    if ( year < 0 .or. mon < 0 .or. day < 0 .or.  &
      &  hour < 0 .or. min < 0 .or. sec < 0         ) then
      year=abs(year) ; mon=abs(mon) ; day=abs(day)
      hour=abs(hour) ; min=abs(min) ; sec=abs(sec)
      pm = '-'
    else
      pm = '+'
    end if
 
    csec = tochar(sec)
    if ( trim(csec) == '-0.' ) csec = '0.'
    do while ( index('123456789.', csec(len_trim(csec):len_trim(csec)) ) == 0 )
      if ( len_trim(csec) < 2 ) exit
      csec = csec(1:len_trim(csec)-1)
    end do
    if (int(sec) > -1 .and. int(sec) < 10) then
      if (len_trim(csec) >= len(csec)) then
        csec = '0' // trim(csec(1:len(csec) - 1))
      else
        csec = '0' // trim(csec)
      end if
    end if
    csec_len = len(trim(adjustl(csec)))
    if (csec(csec_len:csec_len) == '.') csec = csec(1:csec_len-1)
 
    result = cprintf('%c%04d-%02d-%02dT%02d:%02d:%c', &
      & i=(/year, mon, day, hour, min/), &
      & c1=pm, c2=trim(csec))
  else
    sec = diff % sec
    result = tochar( sec )
  end if
 
end function dcdifftimetochar
 
function dcdatetimetocharcal(time, upcase) result(result)
 
  use dc_types, only: token
  use dc_present, only: present_and_true
  use dc_date_types, only: dc_datetime, &
    & cal_cyclic, cal_noleap, cal_julian, cal_gregorian
  use dc_string, only: toupper
  character(TOKEN) :: result
  type(dc_datetime), intent(in):: time
  logical, intent(in), optional:: upcase
continue
  select case( time % caltype )
  case(cal_cyclic)
    result = 'cyclic'
  case(cal_noleap)
    result = 'noleap'
  case(cal_julian)
    result = 'julian'
  case(cal_gregorian)
    result = 'gregorian'
  case default
    result = 'none'
  end select
 
  if ( present_and_true(upcase) ) then
    call toupper(result) ! (inout)
  end if
 
end function dcdatetimetocharcal