Using the 'non-java' option for the CGI, the time is reported properly for the timezone. Further, this option results in less network traffic (5K as opposed to 20K), and hence a slightly quicker response. The code below also checks the response against the local (computer) time so you can tell if you're in sync with the remote time server. (If you have a slow internet connection, this may app may not work for you because it won't get through the loop's conditional.) 
#!/usr/bin/perl

use strict;
use warnings;

use LWP::UserAgent;

# Modify the args as needed for your locale
my $URI = 'http://www.time.gov/timezone.cgi?Eastern/d/-5';

MAIN:
{
    # Create user agent
    my $ua = LWP::UserAgent->new;

    # Create request
    my $req = HTTP::Request->new(GET => $URI);

    # Get remote time, and monitor local (computer) time
    my ($res, $t1, $t2);
    do {
        # Get local time
        $t1 = time();
        # Execute request
        $res = $ua->request($req);
        # Read local time again
        $t2 = time();
        # Loop if the two measures of local time differ
    } while ($t1 != $t2);

    # Check response
    if ($res->is_success) {
        # Extract remote time
        my ($hh, $mm, $ss) = $res->content =~ />(\d{1,2}):(\d{2}):(\d{
+2})</;
        if (defined($ss)) {
            # Output remote time
            printf("Remote time: %02d:%02d:%02d\n", $hh, $mm, $ss);
            # If local and remote times differ, then output local time
+ as well
            if ($ss != $t1 % 60) {
                ($ss, $mm, $hh) = (localtime($t1))[0-2];
                printf("Local time : %02d:%02d:%02d\n", $hh, $mm, $ss)
+;
            }
        } else {
            print("ERROR: Time not found in returned results.\n");
        }
    } else {
        print('ERROR: ', $res->status_line, "\n");
    }
}

exit(0);

# EOF

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Remember: There's always one more bug.

In reply to Re: NIST Atomic Clock Time by jdhedden
in thread NIST Atomic Clock Time by reptile

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