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Discover LudwigThe phrase 'birthday by' is correct and can be used in written English.
It is used to indicate a date or deadline by which something is to be done or completed in time for a birthday, for example: "I need to buy a present for my mother's birthday by Friday."
Exact(60)
HAPPY BIRTHDAY, by Danielle Steel.
-- From "Gravedigger's Birthday," by BJ Ward, $200202.
He famously missed his own birthday by three months.
"It missed its fifth birthday by a week," he said.
Remembered on her 28th birthday by her mother in Egypt.
Remembered on her 26th birthday by her mother.
From "Søren K.'s Two-Hundredth Birthday," by Judith Thurman.
"Hey, happy birthday, by the way," said her husband, Augie, with a wink.
Muhammad defied his parents and marked his 12th birthday by continuing to protest.
CARROLL COLLINS marked her 48th birthday by cooking for 140 people.
MATT OKOH celebrated his 29th birthday by scoring on a penalty kick with four minutes left.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com