Win8 Strawberry 5.8.9.5 (32)  Sun 03/14/2021 21:56:16
C:\@Work\Perl\monks
>perl -Mstrict -Mwarnings

my %hash;

$hash{'ID'}{'NET'} = [ qw(
  2019-11-07T20:31:10.000Z  2021-03-10T13:58:50.000Z  2021-02-19T13:47:25.000Z
  ) ];

my $most_recent_date_time = (sort @{ $hash{'ID'}{'NET'} })[-1];
print "'$most_recent_date_time' \n";

^Z
'2021-03-10T13:58:50.000Z'