> For the complete documentation index, see [llms.txt](https://water-strategy.gitbook.io/waterstrategy/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://water-strategy.gitbook.io/waterstrategy/zhong-guo-ren/jiao-cheng/creating-and-running-a-simple-model/creating-and-running-a-model/setting-the-time-horizon.md). # 设定时间范围请观看视频页面了解更多详情。 {% embed url="" %} 点击 **网络级数据** 菜单按钮。

出现网络级数据窗口。这个 **timestepper.start，timestepper.end** 和 **timestepper.timestep** 需要定义设置，即模型时间范围的开始和结束日期以及模型运行的时间步长。我们的数据集中的时间序列为每月一次，但我们将以 1 天的时间步 (1D) 运行模型。时间步长可以是任意天数，每周 (W) 和每月 (M)。请按以下方式设置数据： **timestepper.end** = 2021-12-**1234567890**\_\_\_\_-**1234567890**\_\_ **timestepper.start =** 2020-01-**1234567890\_\_\_\_\_\_\_1234567890**\_\_ **timestepper.timestep =** D 点击 **编辑** 按钮，选择 **描述符** 对于每个时间步长属性。在上面输入以下数据，然后单击 **保存**。这个时间范围可能比我们的输入数据短，但开始和结束日期必须在您的数据范围内。日期格式和语法很严格。

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