We present a method to investigate relativistic effects arising from large masses. The method is non-perturbative and employs a mean-field approximation and gravitational lensing. Using this method and a basic model of disk galaxy, we find that relativistic corrections to the rotation curves of...
and if time dilation is applied to the entire universe dark energy would also cease to exist. which the above formula shows.
if you square that number it will give you the apparent time dilation that also includes the redshift expansion.
not sure the exact numbers from the new findings but i think this is very close to the media reports.
they say 5 times at 12 billion years ago. My calculations put it 5 times at ~12.33 billion years ago.