Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Hello,

I'm working with Ory's suite of self-hosting solutions and I have a question about using Ory Keto:
*Is it possible to manage the start and end dates of access to one or more resources?*
I couldn't find any information about date management in the Ory Keto self-hosting documentation.

To give you some context for my use case, I've modelled three Entities in Ory Keto:
• `User`, which represents a user
• `Offer`, which represents a group giving access to one or more products, and with which users can be associated
• `Product`, which represents the resources accessible to `User`, with or without belonging to an `Offer`.
*I would therefore like to be able to define a start date and an end date when I link a* `User` *to an* `Offer` *or a* `Product`*.*

Thank you in advance for your reply. Don't hesitate to let me know if you need more information about my case.

Unsure but I know they do not support TTL
<https://github.com/ory/keto/issues/346>