I'm trying to use a web worker to call a function geoValidate in an inactive browser page based on a specific timer. My geoValidate function itself works fine when I call it manually (or shorten the timer to run when the page is still active), but I'm new and struggling conceptually with how to setup the web worker.

showPabeValidate.js

const date = Date().toString();
const currentDateParse = Date.parse(date);
const trigger = Date.parse(startTime) + (1000 * 60 * 15)// this is 15 mins after the event starts

setTimeout( geoValidate, (trigger - currentDateParse))

function geoValidate () { 
     // the code in here works fine
    }
 }

worker.js

addEventListener('message', geoValidate => {
    // not even sure where to start here
})

How could I tie these two functions together and trigger the geoValidate function based on the timer trigger - currentDateParse