如何将时间戳转为日期

1.数据库数据如下
[{"_id":"63798c84f1492c0001845296","type":0,"lunar":0,"name":"test","time":1668873600000,"user_id":"6379890a51251300010b25c8"},{"_id":"63798c84f1492c0001845297","type":1,"lunar":0,"name":"test","time":1668873600000,"user_id":"6379890a51251300010b25c8"}]

2.准备将time字段的时间戳转为日期对象以便后续执行日期转换操作

1. 代码如下
   const $ = db.command.aggregate
   const {
   result: { errCode, data },
   } = await db
   .collection('special-days')
   .aggregate()
   .match({
   user_id: db.getCloudEnv('$cloudEnv_uid'),
   })
   .addFields({
   day: $.add([new Date(0), '$time']),
   })
   .sort({
   day: -1,
   })
   .end()

2. 报如下错误
   InternalServerError errCode: InternalServerError | errMsg: Command failed with error 40180 (Location40180): 'Invalid $addFields :: caused by :: an empty object is not a valid value. Found empty object at path day' on server 192.168.146.109:3717. The full response is { "operationTime" : { "$timestamp" : { "t" : 1668915057, "i" : 3 } }, "ok" : 0.0, "errmsg" : "Invalid $addFields :: caused by :: an empty object is not a valid value. Found empty object at path day", "code" : 40180, "codeName" : "Location40180", "$clusterTime" : { "clusterTime" : { "$timestamp" : { "t" : 1668915057, "i" : 3 } }, "signature" : { "hash" : { "$binary" : "/pjU/YnD6uto8c3I wwntakBt2U=", "$type" : "00" }, "keyId" : { "$numberLong" : "7124964235662065714" } } } }
   VM6200 WAService.js:1 Error: errCode: InternalServerError | errMsg: Command failed with error 40180 (Location40180): 'Invalid $addFields :: caused by :: an empty object is not a valid value. Found empty object at path day' on server 192.168.146.109:3717. The full response is { "operationTime" : { "$timestamp" : { "t" : 1668915057, "i" : 3 } }, "ok" : 0.0, "errmsg" : "Invalid $addFields :: caused by :: an empty object is not a valid value. Found empty object at path day", "code" : 40180, "codeName" : "Location40180", "$clusterTime" : { "clusterTime" : { "$timestamp" : { "t" : 1668915057, "i" : 3 } }, "signature" : { "hash" : { "$binary" : "/pjU/YnD6uto8c3I wwntakBt2U=", "$type" : "00" }, "keyId" : { "$numberLong" : "7124964235662065714" } } } }