We can get the current Unix epoch timestamp in JavaScript (e.g. Node.js) with the following:
const epoch = Math.round(new Date().getTime() / 1000) console.log(epoch)
Result:
1601941415
We can also use valueOf:
const epoch = Math.round(new Date().valueOf() / 1000) console.log(epoch)
Result:
1601941860
Probably the best way is using the static method now from Date:
const epoch = Math.round(Date.now() / 1000) console.log(epoch)
Result:
1601941936
Note that we need to divide by 1000 because the original result is in milliseconds.