Websocket javascript response baaed countdown

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jQuery

Hi i want to build a Countdown timer from the response i am getting from WebSocket api

From the wss response i am getting synchronous time in epoch format
"start_time":

1562254114

"end_time" : "

1562254414

Not having any issue with epoch, i just want to create a Countdown timer based on this "start_time" and "end_time" using jQuery.

Will you please help how to start?
Earlier response recreated...

What I have tried:

After contacting epoch to human time the difference between start_time and end_time is 5 minutes, in seconds it's 300

so the equation should be 300/100,the result to update each second will come 3 seconds so each second end_time minus 3 seconds

But how to implement