> For the complete documentation index, see [llms.txt](https://docs.avonnicomponents.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.avonnicomponents.com/flow/actions/data-manipulation-and-transformation/sobject-collection-to-calendar-marked-date-collection.md).

# SObject Collection to Calendar Marked Date Collection

## Overview

This action streamlines the process of highlighting important dates on an Avonni Date Picker component. It takes data from your Salesforce objects and automatically converts it into a format that the [Date Picker](/flow/flow-components/date-picker.md) understands, making it easy to mark key dates visually.

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## How it Helps

Imagine you want to show upcoming opportunity close dates on a calendar. This action lets you easily pull those dates from your opportunity records and display them as marked dates on the Date Picker, giving your users a clear visual overview.

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## When to Use It

This action is perfect for:

* **Highlighting key dates from any Salesforce object.**
* **Visualizing deadlines, events, or milestones on a calendar.**
* **Improving the user experience of the Avonni Date Picker.**
* **Avoiding complex code or workarounds for marking dates.**

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## Example

To display all upcoming Task due dates for a Contact on a calendar:

1. **Retrieve Tasks:** Use a "Get Records" element to fetch the Contact's Tasks.
2. **Configure the Action:** Select the Task collection and map the "Due Date" field.
3. **Display on the Date Picker:** Connect the action's output to the "Marked Dates" attribute of the Avonni Date Picker component.

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## Key Considerations

* Ensure the date field you select is valid for the chosen object.
* Customize the appearance of marked dates using styling options.
* For advanced date manipulation, use formulas or Apex before using the action


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