how to convert particular time into UTC timestamp

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How do you get a timestamp in JavaScript? 35 answers

How to set Hours,minutes,seconds to Date which is in GMT 3 answers

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You can just create UTC Timestamps with the full date. You can use the .getTime() function of the Date object. You will get the milliseconds since 1970/01/01 and then divide it with 1000 to get the seconds.

let datestring = "2017-10-21 13:22:01";
let date = new Date(datestring);
console.log(date.getTime() / 1000); // will return 1508584921

You can also take a look at Moment.js which is great for handling Date and Time in Javascript.

EDIT: If you want todays date 22:00:00 just init new Date and set the time like this:

let date = new Date();
date.setHours(22);
date.setMinutes(0);
date.setSeconds(0);

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