"Julia goes home on Wednesday."

Translation: जूलिया बुधवार को घर जाती है।

[This_is_Roshan]

Why do we use को instead of पर or में?

[GoWiP]

It's not exactly answering the why, because I wouldn't know how the language came to be in such a way, but it's just like with the time of day:

रात को

शाम को

and also then

बुधवार को

So that just seems to be how it is when talking about time in this way in Hindi.

[CathyIsAwesome]

In this case, को is used because it means "on."

को = on
(On Wednesday
बुधवार को
budhavaar ko)

में = in
(In April
अप्रैल में
aprail mein)

से = from / since
(From yesterday
कल से
kal se)

"at" has several choices depending on what type of "time" is used:

पर = at
(At lunch
दोपहर के भोजन पर
dopahar ke bhojan par)

मे = at
(At noon
दोपहर मे
dopahar me)

के = at
(At 5 pm
शाम के 5 बजे
shaam ke 5 baje)

[Mela647621]

Why is there an hai at the end? In all other sentences it just ends with the verb in the future