How to fix auth/invalid-creation-time: Creation time must be valid UTC date string in Firebase

What this error means

The error indicates your application is trying to set a user's creationTime field with a value that doesn't conform to Firebase's required UTC date format.

Typical symptoms

• Firebase Admin SDK throws error when calling createUser() or updateUser()
• User migration scripts fail with timestamp validation errors

Common causes

1. Providing a non-UTC timestamp string
2. Using local time format instead of UTC

How to fix "auth/invalid-creation-time: Creation time must be valid UTC date string"

Advanced notes

Frequently asked questions

What does "auth/invalid-creation-time" mean?

The error indicates your application is trying to set a user's creationTime field with a value that doesn't conform to Firebase's required UTC date format.

How do I fix "auth/invalid-creation-time"?

This Firebase Authentication error occurs when you attempt to create or update a user with an invalid creation time timestamp.

What causes "auth/invalid-creation-time"?

Providing a non-UTC timestamp string Using local time format instead of UTC

Is the "auth/invalid-creation-time" error serious?

It is a medium-severity error — more of a blocker than a risk. The steps above resolve it.

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Official resources & further reading

• 📚Firebase Official Documentation
• 📖
  Firebase Admin SDK - Create a User(Official Docs)