Template toolkit rendering a hash

I wanted to render a which I generated within my app; it is a calendar basically:
$calendar{$year}{$month}{$day} = daynumber; which I add stash as:
$c->stash->{calendar} = $calendar;

the code I used to get this working is as follows:

[% FOREACH year IN calendar.keys -%]
[% FOREACH month IN calendar.$year -%]
[% SET m = month.key %]
[% FOREACH day IN calendar.$year.$m -%]
[% SET d = day.key %]
values =
[% year %],
[% month.key %],
[% day.key %],
day number = [% calendar.$year.$m.$d %]


[% END %]
[% END %]
[% END %]