From the blogs at Big Think (Frank Jacobs), this map shows that how a German says ‘it is ten fifteen’ will give away from where in Germany they hail.
But 10:15 is not the only giveaway:
Other isogloss maps at this page of the Philologisch-Historische Fakultät at Augsburg University show a similar diversity of geographic distribution for such concepts as Pfannkuchen (pancakes), Hefegebäckmann (a traditional German pastry in the shape of a person), and Hausschuhe (indoor slippers).
The gringo equivalent would be the way that people refer to carbonated beverages across the U.S. Some call it soda, some call it pop, some call it soda pop, and apparently some places in the south will call all carbonated beverages coca-cola. This is the isogloss map equivalent:
Via DAN JURAFSKY from The Language of Food