If you subscribed to Fortnite Crew via a third-party platform like Xbox, Nintendo, Playstation, the billing date of your subscription depends on the platform you've used to subscribe or purchase the subscription.
Your Fortnite Crew Subscription date on the Epic Games side is the date the subscription reflects on our end and may vary from the billing date from your payment platform.
Please reach out to your payment platform for clarification and more information about the billing date of your subscription.