Need to access year/month variable when grouping entries by date

Question

Having issues trying to access the year & month variable when grouping entries by month-year. The code is outputting the desired results (ie. December 2014), however I would like to format the url by 'year/month'.

Archives

Browse news & articles for the last year.

{% set allEntries = craft.entries.section('news').limit(null) %}
<ul>
{% for date, entries in allEntries | group('postDate|date("F Y")') %}
    <li><a href="{{ year }}/{{ month }}">{{ date }}</a></li>
{% endfor %}
</ul>

Answer 1

If I understand your example correctly, a simple hyphen would do the trick — "YYYY-MM" is a format the date filter recognizes.

{% set entries = ... %}
{% set entriesByMonth = entries|group('postDate|date("Y-m")') %}
{% for month, entries in entriesByMonth %}
  <li>
      <a href="{{ month|date("Y") }}/{{ month|date("m") }}">
        {{ entries | length }} entries in {{ month|date("F Y") }}
      </a>
  </li>
{% endfor %}

Answer 2

The year and month variables are not defined, so you'd first have to get these from the 'date' variable.

You could do this by using Twig's split function and splitting date by the space in between:

{% set dateParts = date | split(' ') %}
{% set month = dateParts[1] %}
{% set year = dateParts[0] %}

<a href="{{ year }}/{{ month }}">{{ date }}</a>

Answer 3

I was going to suggest using twig's date filter to format the date as needed, but as Paul astutely pointed out in his comment, you don't really have a dateTime variable to work with.

So my answer is use Paul's answer. ;)