- Implemented PhoneNumber class for creating and validating E.164 formatted phone numbers.
- Added InvalidPhoneNumberError for handling invalid phone number inputs.
- Created comprehensive unit tests covering various scenarios for phone number creation, validation, and equality checks.
- Ensured immutability and proper serialization of the PhoneNumber object.
- Implemented DateTime class for handling ISO date-time parsing, formatting, and validation.
- Added InvalidDateTimeError for error handling in date-time operations.
- Created extensive unit tests covering various scenarios for date-time creation, parsing, and formatting, ensuring robust functionality and error handling.
- Included tests for timezone handling, invalid inputs, and edge cases to validate the DateTime implementation.
shancheas