> For the complete documentation index, see [llms.txt](https://developers.docstudio.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.docstudio.com/api-documentation/template-api/template-dynamic-fields-api/date-field-api.md).

# Date Field API

Use this page to add a date field to template XML. Assign the field to a role with `roleId`, then reuse the same field `name` in envelope requests.

### Date field example

```xml
<field
    type="datetime"
    name="delivery_date"
    placeholder="Select delivery date"
    roleId="fd8cb669-db1d-41e1-8f6c-2ad3f8fa981a"
    optional="false"
    time="true"
    search="true"
    min="0"
    max="30"
/>
```

### Required attributes

* `type` — field type. Use `datetime`.
* `name` — field name. Use 1 to 128 characters. Do not use `&`, `"`, `<`, or `>`. Keep the value unique within one document.
* `roleId` — role identifier for the recipient who fills the field.

### Optional attributes

* `placeholder` — placeholder text shown in the template and envelope. Use 0 to 1024 characters. If you omit it, the envelope shows the field name.
* `optional` — set to `true` if the recipient can leave the field empty. If you omit it, the default value is `false`.
* `time` — set to `true` if the field should accept a time value together with the date.
* `search` — set to `true` if the field value should be available in envelope search. If you omit it, the default value is `false`.
* `min` — minimum day offset allowed from the envelope creation date.
* `max` — maximum day offset allowed from the envelope creation date.

### Validation rules

* `min` and `max` support values from `-9999` to `9999`.
* `min` and `max` define day offsets from the envelope creation date.

### Value format

Use ISO 8601 values, such as:

* `2019-12-31T23:59:59+02:00`
* `2019-12-31T23:59:59Z`

### Related topics

* [Template Dynamic Fields API](/api-documentation/template-api/template-dynamic-fields-api.md)
* [Template Structure API](/api-documentation/template-api/template-structure-api.md)
* [Send Envelope](/api-documentation/envelope/send-envelope.md)
* [Fill Envelope](/api-documentation/envelope/fill-envelope.md)