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Discover LudwigThe phrase "same birthday as" is grammatically correct and can be used in written English.
It is often used when comparing two or more people who have the same birthday. Example: "John and Sarah have the same birthday as me, so we always celebrate together."
Exact(17)
Dakotah has the same birthday as Billy!
"He has the same birthday as me".
"Evidently having the same birthday as Jesus paid off," he said the other day.
"Did you know he has the same birthday as Isaac Newton and Jesus?" "I didn't know about Isaac Newton, Thompsonn said thoughtfully.
But Potter wasn't born in the late Eighties, instead James and Lily welcomed their bundle of joy into the world on 31 July 1980, which also happens to be the same birthday as JK Rowling who turns 50 today.
He wasn't talking about the hotly discussed possibility that said baby might have the same birthday as William (June 21st), or of the length of time since their marriage (nineteen months).
Similar(42)
The problem is to find the probability that among n students in a class, no two or more students share the same birthday under the assumption that individuals' birthdays are independent and that for every individual, all 365 days of the year are equally likely as possible birthdays.
In one series of experiments for example, Burger and his colleagues illustrated how perceived incidental coincidences – like having the same birthday or name as someone else – can change our behaviour towards that person.
A woman approached, gushing excitedly that she shared the same birthday -- Sept. 13, 1971 -- as the designer.
(They have the same birthday).
We also have the same birthday.
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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