If there are HTTP redirects or equivalent when navigating and all redirects and equivalents are from the same origin, the redirectEnd property must return the time immediately after receiving the last byte of the response of the last redirect. Otherwise, this property must return zero.
An Integer value that represents the time immediately after receiving the last byte of the response of the last redirect.
- Navigation Timing, Section 4.2
The value reported by the redirectEnd property represents the number of milliseconds between the recorded time and midnight January 1, 1970 (UTC).
The following example shows how to calculate the time required to redirect the document.
var oTiming = window.performance.timing; var iTimeMS = oTiming.redirectEnd - oTiming.redirectStart;