Hi Sarah, While all languages have equivalents of "How is your day", you simply can't translate every phrase from your native language into your target language word for word. If you are new to romance languages, you will soon discover many differences between even the most basic phrases. Another simple example that comes to mind is "Cuantos años tienes?" Why do Spanish speakers say "How many years do you have?" That's just the way it is. On the bright side, there are many cognates between English and Spanish than can help you pick up the language more quickly. Check out this article to see what I mean: http://www.realfastspanish.com/vocabulary/spanish-cognates Good luck!

That is because in Spanish "day" is thought as a process or experience and not as an entity. To illustrate, let me give you a couple of examples: A. How is she? B. How is the soccer game going? C. How did the surgery go? In sentence A, "she" is referring to an entity, a person. In sentence B, "the soccer game" is seen as an activity that unfolds through time. In sentence C, "the surgery" is seen as a surgical procedure. Spanish speakers think about "day" as English speakers think about "game" and "surgery". Thus, the verb "go" in this examples is rendered as "ir" or "va" when conjugated in simple present 3rd person singular. As for why do we think about "day" like that, language is arbitrary. We do it just because, there's no reason behind it.

cómo va el día? qué tal tu día de hoy? (más informal) cómo va su día también es correcto.