---
title: "Reformat the Birthday"
slug: "reformat-the-birthday"
description: "How to reformat the format of the birthDate field in Studio"
tags: ["Studio", "Field Mappings", "Advanced"]
updated: 2023-07-31T17:56:52Z
published: 2023-07-31T17:56:52Z
canonical: "help.rapididentity.com/reformat-the-birthday"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.rapididentity.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Reformat the Birthday

## How to Reformat the Birthday Value

The OneRoster standard format for `birthDate` is `yyy-mm-dd`. Use the following expression to reformat the a user's birthdate based on a target application's specific need

```
function() {
    const bday = SRC.birthDate[0];

    if (bday && typeof bday === 'string') {
        const bdaySplit = bday.split('-');

        return bdaySplit[1] + '/' + bdaySplit[2] + '/' + bdaySplit[0];
    }

    return ''
}
```

## Related

- [Studio Expressions](/expressions.md)
- [Studio Mapping Expressions](/studio-mapping-expressions.md)
- [Examples of Mapping Expressions](/examples-of-mapping-expressions.md)