nvim2023/lua/junikim/theme.lua

local day = 9
local night = 19
local hour = os.date("*t").hour
print("hour" .. hour)

local themes = { "catppuccin-macchiato", "catppuccin-mocha" }
local theme = 1

if day <= hour and hour < night then
  theme = 1
else
  theme = 2
end
vim.cmd.colorscheme(themes[theme])

local function toggletheme()
  if theme == 1 then
    theme = 2
  else
    theme = 1
  end
  vim.cmd.colorscheme(themes[theme])
end

vim.api.nvim_create_user_command("ToggleTheme", toggletheme, {})