The day after tomorrow
A literal and very common alternative, meaning 'in two days' time' or 'within two days'.
Another common and slightly more direct way to say 'in two days'. Used interchangeably with 'dentro de dos días'.
The meeting is the day after tomorrow at ten.
We're leaving on vacation the day after tomorrow. How exciting!
I have to turn in the homework in two days.
They return from their trip in two days.
The phrase 'pasado mañana' is the standard and most common term throughout the entire Spanish-speaking world, including Spain and all of Latin America. Alternatives like 'dentro de dos días' are also universally understood.
'Pasado mañana' is the default phrase. You will hear it used consistently in all contexts.
Completely standard. 'Pasado mañana' is used by everyone.
While this guide focuses on Latin American Spanish, it's useful to know that 'pasado mañana' is also the standard term in Spain. There is no difference for this particular phrase.
Saying 'el día después de mañana'. — This is a literal, word-for-word translation from English. While a native speaker would understand you, it sounds very unnatural and clunky. The correct, idiomatic expression is 'pasado mañana'.
Confusing 'pasado' with the past. — Learners often associate 'pasado' with the past (e.g., 'el año pasado' - last year). However, in the fixed expression 'pasado mañana', it functions to mean 'after' or 'beyond'. It's a specific time idiom you just have to memorize.
Saying 'después mañana'. — This is an incorrect simplification. The correct way to use 'después' would be 'después de mañana', but this is still far less common and natural than simply saying 'pasado mañana'.