## Data Formats and Validation

Date and time values must always be provided as **Unix timestamps (seconds)**.

Formatted date strings, locale-specific formats, and timezone annotations are **not supported**.

Incorrect field formats are a frequent cause of validation errors.
Always ensure that submitted values match the expected field type definitions.

Documentation:
[Data field types and Inputs](https://developers.klicktipp.com/guides/data-field-types)