feat: add datetime component (#973)

README.md

@@ -635,6 +635,20 @@ sections = {
 }
 ```
 
+#### datetime component options
+
+```lua
+sections = {
+  lualine_a = {
+    {
+      'datetime',
+      -- options: default, us, uk, iso, or your own format string ("%H:%M", etc..)
+      style = 'default'
+    }
+  }
+}
+```
+
 #### tabs component options
 
 ```lua

lua/lualine/components/datetime.lua

@@ -0,0 +1,31 @@
+-- Copyright (c) 2023 Willothy
+-- MIT license, see LICENSE for more details.
+local lualine_require = require('lualine_require')
+local M = lualine_require.require('lualine.component'):extend()
+
+local default_options = {
+    -- default, us, uk, iso, or format (ex. "%d/%m/%Y ...")
+    style = 'default',
+}
+
+function M:init(options)
+    M.super.init(self, options)
+    self.options = vim.tbl_deep_extend('keep', self.options or {}, default_options)
+end
+
+function M:update_status()
+    local fmt = self.options.style
+    if self.options.style == 'default' then
+        fmt = '%A, %B %d | %H:%M'
+    elseif self.options.style == 'us' then
+        fmt = '%m/%d/%Y'
+    elseif self.options.style == 'uk' then
+        fmt = '%d/%m/%Y'
+    elseif self.options.style == 'iso' then
+        fmt = '%Y-%m-%d'
+    end
+
+    return os.date(fmt)
+end
+
+return M