Get UTC Time from Unix TimeSpan

[sullen abyss]

i have an api that created with C#. that api use jwt for auth.. inside jwt has a property called exp that contain Unix TImeSpan of expire date in UTC Format. so now how to get current date-time as utc format and compare it to expire date?

TL;DR : i want current time as Unix TimeSpan UTC and Compare it with my own Unix TimeSpan UTC.

[craggy lodge]

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[prime tendon]

let utc_timestamp = new Date().getTime();
if (utc_timestamp>=(jwt_exp_time*1000)){
console.log("token expired")
}

[sullen abyss]

thanks but as i know that code return time from system time zone not UTC.

[prime tendon]

iirc it adjust it after conversion, so inside unixtime it's seconds from UTC.

[sullen abyss]

thanks. i will check it if it's work.

no it's not. it's timespan of that timezone.

i think this is what i want,

    const utc = new Intl.DateTimeFormat('en-GB', {
        year: "numeric",
        month: "numeric",
        day: "numeric",
        hour: "numeric",
        minute: "numeric",
        second: "numeric",
        hour12: false,
        timeZone: 'UTC',
    }).format(new Date());

then

const utcNow = new Date(utc).getTime();
//then compar utcNow with my own timezone. i just have to check it to see it's work or not.

if any one has better solution feel free to help me.

[prime tendon]

maybe this

Date.parse(new Date().toISOString())

[sullen abyss]

thanks. yes that is what i want.

and work as expected.