import ssl
import socket
from datetime import datetime, timedelta


def get_ssl_expiration_date(domain, port=443, timeout=5):
    try:
        # 创建一个 SSL 上下文
        context = ssl.create_default_context()
        
        # 创建一个套接字
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.settimeout(timeout)  # 设置超时时间（秒）
        
        # 连接到指定的域名和端口
        sock.connect((domain, port))
        
        # 将普通套接字包装成 SSL 套接字
        with context.wrap_socket(sock, server_hostname=domain) as ssock:
            # 获取 SSL 证书
            cert = ssock.getpeercert()
            
            # 提取证书的到期时间
            not_after = cert['notAfter']
            expiration_date = datetime.strptime(not_after, '%b %d %H:%M:%S %Y %Z')
            return expiration_date
    except socket.timeout:
        print(f"{domain}  请求超时    999")
        # print(f"Connection to {domain} timed out after {timeout} seconds.")
    except Exception as e:
        print(f"{domain}  请求错误    999")
        # print(f"Error fetching SSL certificate for {domain}: {e}")
    finally:
        sock.close()  # 确保套接字被关闭

    return None
def main():
    # 读取域名列表
    with open('domains.txt', 'r') as file:
        domains = [line.strip() for line in file]

    # 获取当前日期
    now = datetime.now()

    # 遍历域名列表并获取 SSL 证书到期时间和剩余天数
    results = {}
    print('域名    过期日期    剩余时间')
    for domain in domains:
        expiration_date = get_ssl_expiration_date(domain, timeout=1)
        if expiration_date:
            days_remaining = (expiration_date - now).days
            results[domain] = (expiration_date, days_remaining)
            print(f"{domain}  {expiration_date.strftime('%Y-%m-%d')} {days_remaining}")

    # 输出结果

if __name__ == "__main__":
    main()

在domains.txt里面写入需要检测的域名，执行脚本进行检测：