By when vs When by

Both "by when" and "when by" are correct and commonly used phrases in English. They are interchangeable and can be used depending on personal preference or the flow of the sentence.

Last updated: March 31, 2024 • 1410 views

This phrase is correct and commonly used in English.

"By when"

The phrase "by when" is used to inquire about the deadline or the time by which something needs to be completed or achieved.

Examples:

Can you let me know by when you need the report?
Please inform us by when you plan to arrive.
I will finish the project by when you requested.

Show examples from the web [+]

The internal market strategy 2003-2006 sets out exactly what needs to be done by whom and by when.
By when might such a strategy be ready?
By when does it expect to have completed the safety evaluation?
By when is it proposed that European harmonisation of labelling should be achieved? -
By when does the Commission believe such measures could be in place?
By when does the Commission hope to have completed the impact assessments for the Mercosur negotiations' agricultural offers?
By when in law is the Commission obliged to give its opinion on the complaint lodged?
By when does the Commission expect to come out with these two documents?
What is the first step towards...? By when are you planning to...?
(Total price 199.-) Details More accessories Do you still have questions? Help and support By when must I choose my preferred delivery method so that timely delivery can be guaranteed?
I'll come by when you're at work tomorrow.
Also the one that passed by when faculty security was chasing you.
Drop by when you're free.
Drop by when you can. 7/2 Zhejiang Street.
They come by when you're not here.
They came by when you first got here.
We were walking by when I heard screams.
Guy was just walking by when the job went down.
My class wants you to come by when you get back.
I was passing by when my motorcycle unexpectedly broke down...

Alternatives:

when by

This phrase is correct and commonly used in English.

"When by"

The phrase "when by" is also used to inquire about the deadline or the time by which something needs to be completed or achieved.

Examples:

When by do you need the documents?
Let me know when by you can finish the task.
When by should I expect your response?

Show examples from the web [+]

When by some Miracle of miracles He'll turn around and look at me
Still I can't help wondering if I'll ever live to see that day When by some
When by my side you'll stay And you, you will always be
That way of thinking got turned on its head when by chance I went to hear Evelyn Fox Keller give a talk about her experiences as a woman in science.
And there were days, good days, when by anyone's judgment... they would have to be considered clever.
If not, does it intend to propose specific legislation, and when by?
I was actually doing laundry when I got a call from my husband and he had thought that a bomb had gone off in his building and when by the time he had called me he had checked all those avenues and said that,
It is illogical to be dismissive about people fleeing Iraq or Afghanistan, implying that they are undeserving scroungers, when by common agreement the regimes of those countries are deemed brutal and depressive, and even deserving of military attack.

Alternatives:

by when

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By when vs When by

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