dalet contains parsers and validators for common text data types, such as phone numbers, dates, URLs, domain names, email addresses and country names. It can be used to normalize source data before further processing.

Most of the functionality of dalet is provided by third-party packages which are imported and exposed in a uniform way.

Dates in dalet are handled as ISO 8661 prefixes. That means that valid dates can indicate a loss of precision by shortening dates down to either a year (2017), or a year-month combination (2017-02).

If a date is not recognized as a valid ISO 8661 prefix and no format has been specified, dalet will attempt to recognize the format used.