Process NO 1
You can change your birthday after limit.
Just visit any one link :
Then enter your real birthday, reason of changing and finally click Send.
Process NO 2
First, Go to your Facebook Profile and if you are using PC then Click Update Info on your cover photo and if you are on Mobile then go to About section.
Then Click Contact and Basic Info
After then Scroll down, You will see Facebook Birthday Setting, Click Edit next to Date Of Birth.
Now Choose your Birthday and then Click Save Chang
This was how you could change your facebook birthday or date. You can change who can see your birthday by adjusting the audience. I tested this then my birthday was changed within an hour, but I recommend you to wait for 24-48 hours.
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