import json
from datetime import datetime
from typing import Any


class DateTimeEncoder(json.JSONEncoder):
    """A custom JSON encoder that handles datetime objects.

    This encoder extends the json.JSONEncoder class to provide serialization
    support for datetime objects, converting them to ISO format strings.

    Methods
    -------
    default(obj: Any) -> str
        Encode datetime objects as ISO format strings.
    """

    def default(self, obj: Any) -> str:
        """Encode the given object as a JSON-serializable type.

        Parameters
        ----------
        obj : Any
            The object to encode.

        Returns
        -------
        str
            The ISO format string if the object is a datetime, otherwise
            delegates to the superclass encoder.
        """
        if isinstance(obj, datetime):
            return obj.isoformat()
        return super().default(obj)