  We carry out a search for signatures of cosmological time dilation in the
light curves of Gamma Ray Bursts (GRBs), detected by the Neil Gehrels Swift
Observatory. For this purpose, we calculate two different durations ($T_{50}$
and $T_{90}$) for a sample of 247 GRBs in the fixed rest frame energy interval
of 140-350 keV, similar to Zhang et al. We then carry out a power law-based
regression analysis between the durations and redshifts. This search is done
using both the unbinned as well as the binned data, where both the weighted
mean and the geometric mean was used. For each analysis, we also calculate the
intrinsic scatter to determine the tightness of the relation. We find that
weighted mean-based binned data for long GRBs and the geometric mean-based
binned data is consistent with the cosmological time dilation signature,
whereas the analyses using unbinned durations show a very large scatter. We
also make our analysis codes and the procedure for obtaining the light curves
and estimation of $T_{50}$/$T_{90}$ publicly available.
