DateTimePlugin does not process the date= parameter correctly.

The problem is in the way this plugin implements the _isNumber() routine.

sub _isNumber {
    my ($n) = @_;

    eval {
        local $SIG{__WARN__} = sub { die $_[0] };
        $n += 0;
    };
    if   ($@) { return 0; }
    else      { return 1; }

}

This fails in my perl version: "This is perl 5, version 22, subversion 1 (v5.22.1) built for i686-linux-gnu-thread-multi-64int"

A working test would be:

sub _isNumber {
    my ($n) = @_;
if( ($n =~ /^\d+$/) ) { return 1; }
else {  return 0; }

}

But I chose to use DateManipPlugin instead.

Suggest adding a comment in DateTimePlugin documentation to mark its demise.

-- BramVanOosterhout - 02 Jan 2020

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