The Tokei plugin introduces a customizable clock feature to Obsidian, allowing users to view and manage timezones directly within their workspace. It provides options to personalize the clock's layout and appearance using custom CSS snippets. Users can add multiple timezones by entering names or offsets in UTC format, with support for fractional offsets like +5.5. The plugin also includes an alternative style snippet for experimentation. Tokei's drag-and-drop functionality enables users to position the clock conveniently within their setup, enhancing productivity by keeping track of global times.