11 is juuippun ;3 Likewise, 13 is juusanpun, 14 is juuyonpun, etc. You can use the Dynamic Clock to check for these irregularities, just click the "Dynamic Clock" button and use the coloured up and down arrows to set the time. How to say it is then written in the blue boxes at the bottom
Very wonderful and concise. Maybe a short sentence or two could be added for asking what time it is? I also seem to remember nanaji being acceptable for over-the-phone usage. But I don't know how widely used this was/is used in reality.