I am most likely looking in the wrong places and have missed some crucial piece of information. I can't get DateTime objects to play well with Template::Stash - the Template::Stash seems to want to compare the DateTime object against the template root, but the DateTime object does not want to be compared with anything other than a DateTime object, or something sufficiently similar. See my code below - it is some convoluted way of printing todays date, except it doesn't: 

use strict;
use DateTime;
use Template;

my $config = {};
my $template = Template->new($config);
my $input = \'[% calendar.ymd(".") %]';

# process input template, substituting variables
$template->process($input, { calendar => DateTime->now })
    or die $template->error();

[download]

After patching DateTime.pm so it gives some better error diagnostics, I get

undef error - Cannot compare a datetime to a regular scalar (2005-02-2
+8T21:51:58 / Template::Stash=HASH(0x2048a14)) at c:/perl/site/5.8.5/l
+ib/Template/Stash.pm line 582

[download]

but I don't want to believe that nobody has used Template::Toolkit and DateTime together, so the error must be somewhere in my usage of one of the two.

Update: DateTime v0.28, Template::Toolkit 2.14

Update 2: I hacked myself a workaround by removing the overloaded string comparison of DateTime. This is horribly ugly and there must be a better way :-(

In reply to Using DateTime together with Template::Toolkit by Corion

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