New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest version of Parse Server.

Issue Description

Parse server replaces null value with a Date set at 1970-01-01 when sending back the data for a query.

Steps to reproduce

In any collection with a Date field, set the value to null (either directly in the MongoDB or through the parse sdk, e.g. object.set('date', null))

Actual Outcome

I get a Date instead of null, set to 1970-01-01. (just like new Date(null)).

Expected Outcome

I expect the value to be null.

Environment

Server

• Parse Server version: 4.10.3
• Operating system: Docker image node:14-alpine
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): AWS

Database

• System (MongoDB or Postgres): MongoDB
• Database version: 4.4.8
• Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): MongoDB Atlas

Client

• SDK (iOS, Android, JavaScript, PHP, Unity, etc): iOS, Android, JavaScript, cURL
• SDK version: not relevant. The network panel in Chrome shows the json sent by parse server already has the issue.

Logs