This is the 7753rd most frequent Korean word.
하루를
"하루를" means "a day" (as an object in a sentence).
In this sentence, '하루를' in this context is the object of the verb '살다' (to live), referring to making the best use of each day.
하루를 열심히 살아야 해요.
You should live your day diligently.
Here, '하루를' serves as the object of the action '계획하다' (to plan), emphasizing daily preparation.
나는 하루를 계획하는 것이 중요하다고 생각해요.
I think planning the day is important.
This sentence uses '하루를' to denote the period or duration of a day during which specific actions will take place.