# Selecting a custom time range


By default, visualizations display the latest hour of data from the profiling group. You can select a different start time and end time to explore other data for other time ranges. This can be helpful to see how performance has changed over time. 

**To select a custom time range**

1. In the **Profiling group detail** page, at the top of the visualization, select the date/time displayed. For example, **2019-12-04 @ 7:30 - 7:40 PST**. 

1. In the **Select a custom time range** page, choose a **Start time**. You can optionally keep the existing start time. 

1. Choose an **End time**. You can optionally keep the existing end time. 

1. Choose **Confirm** to update the visualization. 

If there is not enough data for the selected range, select a different time range. For the CodeGuru Profiler preview, you can reset the time range back to the default by choosing **Profiler**, **Profiling groups** in the navigation pane, and then selecting the profiling group.