[Merem]

In some regions it's (4:15) "Viertel nach vier" while it's also "Viertel fünf" because 4:45 is "Dreiviertel fünf", while in those some regions it's then "Viertel vor fünf".

(Personally, I only use Viertel, halb and Dreiviertel, otherwise it's just "siebzehn Uhr zehn" or something.)

[tharkun__]

I used an English "translation" instead of the German words for the audience here to understand better. What you mention is true and part of my list already e.g.

    4:15: quarter 5 = Viertel fuenf