The measurement of time has always had a big impact on our society. The way we tell the time greatly evolved especially in the last centuries, leading to the creation of always more accurate tools, up to the first wearable technological devices. In this talk you will explore the evolution of horology. You will discover the common elements that remained unchanged across the centuries, and how you can still find them in modern wearable devices. You will also learn about how different it is to develop for a smartwatch, compared to a smartphone, especially considering the Android Wear platform.