如何从JSON中确定时间戳字段？

import json

def find_timestamp(json_data):
    if isinstance(json_data, dict):
        for key, value in json_data.items():
            if isinstance(value, (int, float)):
                # 判断是否为Unix时间戳（以秒为单位）
                if 1e8 < value < 1e15:
                    return key
            elif isinstance(value, str):
                # 判断是否为ISO 8601格式的日期时间字符串
                try:
                    datetime.datetime.fromisoformat(value)
                    return key
                except ValueError:
                    pass
            elif isinstance(value, (dict, list)):
                # 递归遍历嵌套的字典或列表
                result = find_timestamp(value)
                if result:
                    return result
    elif isinstance(json_data, list):
        for item in json_data:
            result = find_timestamp(item)
            if result:
                return result

# 示例JSON数据
json_data = '''
{
  "id": 1,
  "name": "John Doe",
  "timestamp": 1634567890,
  "created_at": "2021-10-19T12:34:56Z",
  "data": {
    "timestamp": 1634567890123
  },
  "items": [
    {
      "timestamp": 1634567890
    },
    {
      "timestamp": "2021-10-19T12:34:56Z"
    }
  ]
}
'''

# 解析JSON数据
data = json.loads(json_data)

# 查找时间戳字段
timestamp_field = find_timestamp(data)
if timestamp_field:
    print("时间戳字段:", timestamp_field)
else:
    print("未找到时间戳字段")