Insert date/time
As this name of this plugin suggests, the Insert Date/Time plugin allows you to insert the date and/or time at the current cursor position.
To enable the plugin:
Press the menu button in the top-right corner of the window and select Preferences ▸ Plugins.
Select Insert Date/Time to enable the plugin.
To use the plugin press Shift+Alt+D, or press the menu button in the top-right corner of the window and select Tools ▸ Insert Date and Time….
By default, the Insert Date/Time plugin will prompt you to choose your preferred date/time format each time that you use the plugin. However, you can choose your own default date and time format by pressing the menu button in the top-right corner of the window and selecting Preferences ▸ Plugins ▸ Insert Date/Time ▸ Preferences.