Your or You’re?
Your choice!
Your
Exemple : ‘’When is your birthday?’’
"Your" and "you’re" are often confused though they have completely different usages. "Your" is the second person possessive adjective and is always followed by either a noun or gerund.
You're
Exemple : ‘’Thank you, you're very kind!’’
"You’re" is a contraction (a shortening) of the words "you" and "are". It has no other uses and should only be used if it can be expanded to "you are."