Run results for: Date.now() vs new Date().getTime() vs performance.measure() vs anchoredClock2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Browser: Chrome 112

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Script Preparation code:

let start = null;
let end = null;

let epochMs = Date.now();
let perfMs = performance.now();

Tests:

Date.now()
start = Date.now(); end = Date.now();
new Date().getTime();
start = new Date().getTime(); end = new Date().getTime();
performance.now()
start = performance.now() end = performance.now()
performance.measure
performance.mark('start') start = Date.now() const { duration } = performance.measure('span', 'start') end = start + duration
Date.now() & performance.now
// 1000.2534221 = offset delta const startDelta = performance.mark('start').startTime - 1000.2534221 startTime = 1000.2534221 + startDelta const endDelta = performance.measure('span_duration', 'start').duration endTime = 1000.2534221 + endDelta