苏宁:
https://f.m.suning.com/api/ct.do
or
http://quan.suning.com/getSysTime.do

{
    "api": "time",
    "code": "1",
    "currentTime": 1647506518039,
    "msg": ""
}
or
{
    "sysTime2": "2022-03-17 16:46:39",
    "sysTime1": "20220317164639"
}


淘宝:
http://api.m.taobao.com/rest/api3.do?api=mtop.common.getTimestamp

{
    "api": "mtop.common.getTimestamp",
    "v": "*",
    "ret": [
        "SUCCESS::接口调用成功"
    ],
    "data": {
        "t": "1647506593231"
    }
}

腾讯: 返回时间和ip
http://vv.video.qq.com/checktime?otype=json

QZOutputJson={"s":"o","t":1647506640,"ip":"120.235.8.39","pos":"---","rand":"a97ZptY1PhW85XEOosiH_Q=="};