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"Treinta" is a noun which is often translated as "thirty", and "es la una" is a phrase which is often translated as "it's one o'clock". Learn more about the difference between "treinta" and "es la una" below.
el treinta(
treyn
-
tah
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
2. (number)
b. thirtieth (in dates)
El cumpleaños de mi padre es el treinta de noviembre.My father’s birthday is on the thirtieth of November.
es la una(
ehs
lah
oo
-
nah
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. it's one o'clock
Es la una de la mañana. ¡Ya duérmete!It's one o'clock in the morning. Go to sleep!