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# Migrating to `rtic-monotonics`
In previous versions of `rtic`, monotonics were an integral, tightly coupled part of the `#[rtic::app]`. In this new version, [`rtic-monotonics`] provides them in a more decoupled way.
The `#[monotonic]` attribute is no longer used. Instead, you use a `create_X_token` from [`rtic-monotonics`]. An invocation of this macro returns an interrupt registration token, which can be used to construct an instance of your desired monotonic.
`spawn_after` and `spawn_at` are no longer available. Instead, you use the async functions `delay` and `delay_until` provided by implementations of the `rtic_time::Monotonic` trait, available through [`rtic-monotonics`].
Check out the [code example](./complete_example.md) for an overview of the required changes.
For more information on current monotonic implementations, see [the `rtic-monotonics` documentation](https://docs.rs/rtic-monotonics), and [the examples](https://github.com/rtic-rs/rtic/tree/master/examples).
[`rtic-monotonics`]: https://github.com/rtic-rs/rtic
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