vs 

QUICK ANSWER
"What time" is a form of "what time", a phrase which is often translated as "a qué hora". "When" is an adverb which is often translated as "cuándo". Learn more about the difference between "when" and "what time" below.
when(
wehn
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. cuándo
When was the last time you cried?¿Cuándo fue la última vez que lloraste?
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
conjunction
a. cuando
I was sleeping when he got home.Estaba durmiendo cuando llegó a casa.
b. en que
That was the year when we bought our first apartment.Ese fue el año en que compramos nuestro primer apartamento.
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what time(
wuht
 
taym
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. a qué hora
What time did you go to bed?¿A qué hora te fuiste a la cama?
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