将 MongoDB 中的日期保存为 64 位整数？

Question

I read that MongoDB stores dates natively as a 64 bit integer. I just did the following (using mongoose in nodejs):

MyModel.updateMany({}, { datePublished: new Date("2021-01-01") }).then(
    function (result) {
      res.json(result);
    }
);

And the result looks like this:

{
   ...
   "datePublished": "2021-01-01T00:00:00.000Z"
}

...doesn't seem to be a 64 bit integer? Or is this correct, and MongoDB shows me something different here (different to the way it internally stores it)?

Answer 1

From the MongoDB Docs:

BSON Date is a 64-bit integer that represents the number of milliseconds >since the Unix epoch (Jan 1, 1970). This results in a representable date >range of about 290 million years into the past and future.

https://docs.mongodb.com/manual/reference/bson-types/#std-label-document-bson-type-date

The dates are stored as an epoch timestamp but is returned as a date object which can be converted into a string if required