> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/introduction-1/simulation-settings/time.sim/step.md).

# step

Time step of the simulation

SWAT+ is able to run at the following time steps:

| Code | Time Step  |
| ---- | ---------- |
| 0    | day        |
| 2    | 12 hours   |
| 24   | hour       |
| 96   | 15 minutes |
| 1440 | minute     |

{% hint style="warning" %}
When using the Green & Ampt method ([gampt](/io-docs/introduction-1/basin-1/codes.bsn/abstr_init.md) in [**codes.bsn**](/io-docs/introduction-1/basin-1/codes.bsn.md)) for calculating surface runoff, the time step of the precipitation data must match the simulation time step.
{% endhint %}