locutus/esm/php/datetime/microtime.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

export function microtime(getAsFloat) {
    //  discuss at: https://locutus.io/php/microtime/
    // original by: Paulo Freitas
    // improved by: Dumitru Uzun (https://duzun.me)
    //   example 1: var $timeStamp = microtime(true)
    //   example 1: $timeStamp > 1000000000 && $timeStamp < 2000000000
    //   returns 1: true
    //   example 2: /^0\.[0-9]{1,6} [0-9]{10,10}$/.test(microtime())
    //   returns 2: true
    let s = 0;
    let now = 0;
    if (typeof performance !== 'undefined' && performance.now && performance.timing) {
        now = (performance.now() + performance.timing.navigationStart) / 1e3;
        if (getAsFloat) {
            return now;
        }
        // Math.round(now)
        s = now | 0;
        return Math.round((now - s) * 1e6) / 1e6 + ' ' + s;
    }
    else {
        now = (Date.now ? Date.now() : new Date().getTime()) / 1e3;
        if (getAsFloat) {
            return now;
        }
        // Math.round(now)
        s = now | 0;
        return Math.round((now - s) * 1e3) / 1e3 + ' ' + s;
    }
}