I can't reproduce your problem. There's no need to escape dollars in single quoted strings. 
#!/usr/bin/perl
use strict;
use warnings;

my $decoded_json = {
    'version' => '1.0',
    'feed' => {
        'xmlns' => 'http://www.w3.org/2005/Atom',
        'updated' => {
            '$t' => '2020-10-16T19:55:33.294Z'
        },
        'gs$rowCount' => {
            '$t' => '1000'
        }}};

print $decoded_json->{feed}->{updated}->{'$t'};  # 2020-10-16T19:55:33
+.294Z

[download]

How should the code return 2019-07-19 when the structure contains 2020-10-16? Maybe the problems happens in the code you didn't show - how do you create the JSON?

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re: Escape $ in JSON::XS decoded by choroba
in thread Escape $ in JSON::XS decoded by johnfl68

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