Create-react-app: Way to add dynamic env field which change for every build creation. e.g timestamp

[simbathesailor]

Is this a bug report?

(write your answer here)
Way to add dynamic env field which change every build creation. e.g timestamp
No

Did you try recovering your dependencies?

yes

(Write your answer here.)

Which terms did you search for in User Guide?

dynamic env configs

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Environment

mac os Mojave 10.14

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Steps to Reproduce

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1. Added .env file
   2.Added REACT_APP_DATE_TIME = new Date().toDateString() in .env file// I know it will not work
2. In index.js file I added
   import dotenv from "dotenv"
   dotenv.config()

Expected Behavior

(Write what you thought would happen.)
I want to add date time of build, in one of my component (Footer component)
How can i do that , I was able to do it when ejected out. But not while I was non ejected
May be I am ignorant here, Please suggest if its possible without ejecting ?

Actual Behavior

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Reproducible Demo

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[ryarasi]

Here's a SO thread describing this in context - https://stackoverflow.com/questions/53028778/how-to-show-build-datetime-on-my-react-web-app-using-create-react-app/53029025?noredirect=1#comment92961563_53029025

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Answered on SO thread.

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For posterity: https://stackoverflow.com/a/53035483/4397028