We use the preposition para (not por) in Spanish to express the time limit/deadline of something.
Here are some examples:
Quiero el informe para mañana a primera hora, por favor.I want the report by first thing tomorrow, please.
Tengo que preparar el discurso para el jueves.I have to prepare the speech by Thursday.
Debemos terminar el proyecto para principios de mayo.We must finish the project by early May.
Note that when para is used in this context, the English equivalent is the preposition by.
Want to make sure your Spanish sounds confident?
We’ll map your knowledge and give you free lessons to focus on your
gaps and mistakes. Start your Braimap today »