function "dtutils.string.substitute()" fails when no time data is provided in Exif data

When running a script using "dtutils.string.substitute()" function on a file without any time data in Exif, the "dtutils.string.substitute()" function fails.

190.9832 LUA ERROR : ...\AppData\Local\darktable/lua/lib/dtutils\string.lua:748: time result cannot be represented in this installation
stack traceback:
	[C]: in ?
	[C]: in function 'os.time'
	...AppData\Local\darktable/lua/lib/dtutils\string.lua:748: in upvalue 'exiftime2systime'
	...AppData\Local\darktable/lua/lib/dtutils\string.lua:843: in function 'lib/dtutils.string.build_substitute_list'
	...AppData\Local\darktable/lua/lib/dtutils\string.lua:1298: in function 'lib/dtutils.string.substitute'

After looking at the "string.lua" code, it seems that "build_substitute_list" function tries to use "0000:00:00 00:00:00" as default value if the exif time is not available, but the "os.time{}" conversion called later through "exiftime2systime(datetime_taken)" does not like it. The minimum time value accepted on several systems is January 1st, 1970. I updated the "string.lua" code on my installation (replacing "0000:00:00 00:00:00" with "1970:01:01 00:00:00") and this fixes the issue.

Code from string.lua :

local function exiftime2systime(exiftime)
  local yr,mo,dy,h,m,s = string.match(exiftime, "(%d-):(%d-):(%d-) (%d-):(%d-):(%d+)")
  return(os.time{year=yr, month=mo, day=dy, hour=h, min=m, sec=s})
end

[...]

function dtutils_string.build_substitute_list(image, sequence, variable_string, username, pic_folder, home, desktop)
[...]
  if image.exif_datetime_taken and image.exif_datetime_taken ~= "" then
    datetime_taken = image.exif_datetime_taken
  else
    if use_millisecs then
      datetime_taken = "0000:00:00 00:00:00.0"
    else
      datetime_taken = "0000:00:00 00:00:00"
    end
  end
[...]

I see this issue on Windows 11, DarkTable 5.4.0. Other systems could behave the same, or not.

Commencez dans lua/lib/dtutils/string.lua par lire build_substitute_list et exiftime2systime, puis exécutez le script de substitution signalé avec une image ne contenant aucune donnée temporelle EXIF. C’est terminé lorsque l’horodatage par défaut est accepté sans erreur os.time sur le système concerné.