Where to find and change your birthday on iPhone

Your birthday on iPhone lives in the Contacts app, in your own contact card. Open Contacts, tap your name at the top of the list (it usually shows as "Me"), then tap Edit in the upper right corner. Scroll down to find the birthday field, tap it, and set your new date using the date picker that appears. Tap Done when finished.

If you do not see a birthday field in your contact card, tap the green plus sign at the bottom left while in Edit mode, then select "add field" and choose birthday from the list. This creates the field so you can enter a date.

The birthday you set here is what appears on your lock screen and in reminders on your actual birthday. It also syncs to other Apple devices if you use iCloud, so changing it on your iPhone updates it everywhere your Apple ID is signed in.

Key Takeaways

  • Open Contacts, tap your own name at the top, then tap Edit to access your birthday field.
  • If no birthday field exists, tap the green plus sign and select "add field" to create one.
  • Changes sync across all your Apple devices through iCloud if you are signed in with the same Apple ID.
  • Your birthday in Contacts is separate from the birth date tied to your Apple ID account, which requires a different process to change.

The difference between your Contacts birthday and your Apple ID birthday

iPhone stores two different birthdays: one in your Contacts card (which you just changed) and one attached to your Apple ID account. The Contacts birthday is what shows on your lock screen and triggers reminders. The Apple ID birthday is what Apple uses to verify your identity and manage account security.

If you need to change the birthday on your actual Apple ID account — the one you use to sign in to iCloud, the App Store, or iTunes — that requires going through Apple's account settings, not Contacts. That process is more restricted because Apple uses your birth date to confirm you are the account owner if you ever need to recover access.

How to change your Apple ID birthday if needed

To change the birth date on your Apple ID itself, go to Settings, tap your name at the top, then tap Password and Security. Scroll down and tap Date of Birth. You will see your current date and an option to edit it. Tap Edit, change the date, then tap Save.

Apple limits how often you can change this date — you typically cannot change it again for 30 days after the first change. This restriction exists because your birth date is part of your account security. If you are trying to correct a mistake you made when you first created your Apple ID, contact Apple Support, as they may be able to override the waiting period.

Why your birthday matters on iPhone

Setting your birthday in Contacts triggers automatic reminders on your actual birthday, so you see a notification when you wake up. It also appears on your lock screen on that day. Some apps use your birthday to customize features — for example, Apple Music may show birthday playlists or recommendations.

Your Apple ID birthday is used by Apple to verify your identity if you forget your password or need to recover your account. It is also used to determine age restrictions for certain content in the App Store and Apple Books. Keeping this date accurate protects your account and ensures parental controls work correctly if you manage a child's device.

What to do if you cannot find the birthday field

If you are in Edit mode on your contact card and still do not see a birthday option, make sure you are editing your own contact, not someone else's. Your contact should be at the very top of the Contacts list and labeled "Me" or your name.

If you are definitely in the right place, tap the green plus sign at the bottom left of the screen. A menu appears with options to add fields. Scroll through and select "birthday." This adds the field to your card so you can enter a date. Once you add it, it stays there for future use.

Syncing your birthday across devices

When you change your birthday in Contacts on your iPhone, it syncs automatically to your iPad, Mac, and any other Apple device where you are signed in with the same Apple ID. This happens through iCloud, Apple's cloud service that keeps your data consistent across devices.

If you change your birthday on one device and it does not appear on another after a few minutes, check that both devices are signed in with the same Apple ID and that iCloud is turned on. Go to Settings, tap your name, then tap iCloud to see which services are syncing. Contacts should be toggled on.

Frequently Asked Questions

Can I change my birthday on iPhone if I do not remember what I set it to?

Yes. Open Contacts, tap your name, and tap Edit. The birthday field shows your current date. If you do not see the field at all, you have not set a birthday yet. Tap the green plus sign, select "add field," choose birthday, and enter the correct date.

Does changing my birthday in Contacts affect my Apple ID?

No. Changing your birthday in the Contacts app only changes what appears on your lock screen and in reminders. Your Apple ID birthday remains separate. If you need to change your Apple ID birth date, go to Settings, tap your name, then Password and Security, and select Date of Birth.

What happens if I set the wrong birthday by mistake?

You can change it anytime by going back to Contacts, tapping your name, tapping Edit, and updating the date. There is no limit to how many times you can change your Contacts birthday. Your Apple ID birthday has a 30-day waiting period between changes, so be careful with that one.

Will my contacts see my birthday if I change it?

No. Your birthday in Contacts is private to you. Other people cannot see it unless you share your contact card with them directly. The birthday field is for your own reminders and lock screen display.