> For the complete documentation index, see [llms.txt](https://docs.ladybug.tools/ladybug-primer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ladybug.tools/ladybug-primer/components/1_analyzedata/analysis_period.md).

# Analysis Period

![](/files/-MihikU4fMUtEjknTkZH)

![](/files/-MihikU5e7GfHgug6lLR) - [\[source code\]](https://github.com/ladybug-tools/ladybug-grasshopper/blob/master/ladybug_grasshopper/src//LB%20Analysis%20Period.py)

Create an Analysis Period to describe a slice of time during the year.

### Inputs

* **start\_month**

Start month (1-12).

* **start\_day**

Start day (1-31).

* **start\_hour**

Start hour (0-23).

* **end\_month**

End month (1-12).

* **end\_day**

End day (1-31).

* **end\_hour**

End hour (0-23).

* **timestep**

An integer number for the number of time steps per hours. Acceptable inputs include: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60

### Outputs

* **period**

Analysis period.

* **hoys**

List of dates in this analysis period.

* **dates**

List of hours of the year in this analysis period.