Devotees of the McDonald’s breakfast menu celebrated in March when it was announced that the fast food chain would extend breakfast beyond the standard 10.30am cut-off time.

The first US state to pilot the plan has chosen a conspicuous date on which to start: 4/20, the annual celebration of cannabis culture.

San Diego's all-day breakfast menu, which starts on Monday April 20, is limited to nine items and McCafé drinks. Customers can get egg McMuffin, sausage McMuffin with egg, sausage burrito, sausage McMuffin, hash brown and hotcakes, oatmeal and yoghurt all day. McGriddles, cakes and steak, egg and cheese bagels have been left off the menu.

Apparently McDonald’s has trouble making sausage and eggs at the same time as burgers and chicken. A McDonald’s employee told BurgerBusiness.com that McDonald’s cooks everything on the grill, rather than in the microwave, which means they don’t have enough space to cook all the breakfast items.

McDonald's meals around the world Show all 14 1 /14 McDonald's meals around the world McDonald's meals around the world Black and White burger, served in China, Hong Kong and Taiwan The black burger contains beef and onion topped with black pepper sauce, while the white burger contains chicken with lettuce and a spicy sauce McDonald's meals around the world McCurry Pan, served in India A bread bowl filled with chicken curry McDonald's meals around the world McBaguette, served in France Baked in a ciabatta roll and topped with emmental cheese McDonald's meals around the world McLobster, served in Canada Only served in summer... McDonald's meals around the world Shrimp burger, served in Japan Prawn-filled burger topped with thousand island sauce McDonald's meals around the world Das Nürnburger, served in Germany Three Bratwurst sausages served with mustard inside a soft white bun McDonald's meals around the world Prosperity Burger, served in Malaysia Meat, meat, meat, onions and black pepper sauce McDonald's meals around the world Chicken Maharaja Mac, served in India McDonald's meals around the world Cheese Fondue (left) and Carbonara Burger (right) Served only in Japan McDonald's meals around the world Pasta Zoo Australia and New Zealand's take on the Happy Meal McDonald's meals around the world Deluxe Breakfast roll, served in Australia With bacon, hash brown an egg and spicy tomato McDonald's meals around the world McBeer Found in all good McEuropean restaurants McDonald's meals around the world McAloo Tikki, served in India McDonald's meals around the world Kiwi stick, served in Italy

McDonald’s have already experimented with extending their breakfast menu. In 2012, they tested breakfast from midnight until 5am. This later became the McDonald’s after midnight menu.