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use strict;
use warnings;
...
{
    print "Old time is outside a half hour\n";
}

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The current time is Di, 20 Dez 2016 10:09:19 Mitteleuropäische Zeit
The old time is Mo, 19 Dez 2016 17:44:00 UTC
Half an hour ago is Di, 20 Dez 2016 09:39:19 Mitteleuropäische Zeit
Old time is outside a half hour