I extracted the data into a json array format. I want to not put the date 01/01/1990 into the report. What do I have to do

Hello,
Thank you for posting your question. 
We’ve come up with 2 possible ways to achieve your task.

1. You can hide particular dates using the filter by members’ names (if your date field has a "type": "date string" or "datetime").
2. You can hide the particular field so it won’t be displayed in the Field List. You can set a "type": "hidden" to this field or just miss this field out of the data types definition.
   Please address the documentation on setting data types in JSON. It should be helpful in your case.

Hope it helps.
Regards,
WebDataRocks Team