如何在celery中反序列化datetime字符串？

import json
from datetime import datetime

class CustomEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, datetime):
            return obj.isoformat()
        return super().default(obj)

from datetime import datetime

class CustomDecoder(json.JSONDecoder):
    def __init__(self, *args, **kwargs):
        super().__init__(object_hook=self.object_hook, *args, **kwargs)

    def object_hook(self, dct):
        for key, value in dct.items():
            if isinstance(value, str):
                try:
                    dct[key] = datetime.fromisoformat(value)
                except ValueError:
                    pass
        return dct

import json
from datetime import datetime
from celery import Celery

app = Celery('myapp', broker='redis://localhost:6379/0')

@app.task
def my_task():
    data = {
        'name': 'John',
        'dob': datetime(1990, 1, 1),
    }

    # 序列化数据
    serialized_data = json.dumps(data, cls=CustomEncoder)

    # 反序列化数据
    deserialized_data = json.loads(serialized_data, cls=CustomDecoder)

    print(deserialized_data['dob'])  # 输出: 1990-01-01 00:00:00