Modify constraints:

• no constraint:
• this year only:
[% start_year = start_date.strftime('%Y'); last_year = (today.strftime('%Y') - 1); IF start_year <= last_year # don't load unless needed %]
• a previous year: [% years = [ start_year .. last_year ]; FOREACH yr IN years.sort.reverse %] [% yr %] [% END %] [% site.html.reset %]
[% END %]
• previous # days: [% site.html.reset %]
• date range: to [% site.html.reset %]