A fuzzy date calculator for Jekyll.

fuzzy-date.html

{% if include.daysDiff >= 365 %}
    {% assign yearDiff = include.daysDiff | divided_by: 365 | round %}
    {% assign yearRemainder = include.daysDiff | modulo: 365 | divided_by: 30 | round %}
    {% if yearRemainder != 0 %}
        {% if yearRemainder > 10 %}
            Almost {{ yearDiff + 1 }} year{% if  yearDiff > 1 %}s{% endif %} {{ include.label }}
        {% elsif yearRemainder >= 6 %}
            {% if yearDiff == 1 %}
                A year and a half {{ include.label }}
            {% else %}
                {{ yearDiff }} and a half years {{ include.label }}
            {% endif %}
        {% else %}
            {% if yearDiff == 1 %}
                Just over a year {{ include.label }}
            {% else %}
                Just over {{ yearDiff }} years {{ include.label }}
            {% endif %}
        {% endif %}
    {% else %}
        {{ yearDiff }} year{% if  yearDiff > 1 %}s{% endif %} {{ include.label }}
    {% endif %}
{% elsif include.daysDiff >= 30 %}
    {% assign monthDiff = include.daysDiff | divided_by: 30 | round %}
    {% if  monthDiff > 1 %}
        {{ monthDiff }} months {{ include.label }}
    {% else %}
        A month {{ include.label }}
    {% endif %}
{% elsif include.daysDiff >= 7 %}
    {% assign weekDiff = include.daysDiff | divided_by: 7 | round %}
    {% if  weekDiff > 1 %}
        {{ weekDiff }} weeks {{ include.label }}
    {% else %}
        A week {{ include.label }}
    {% endif %}
{% elsif include.daysDiff > 1 %}
    {{ include.daysDiff }} days {{ include.label }}
{% elsif include.daysDiff == 1 %}
    A day {{ include.label }}  
{% else %}
    On the same day
{% endif %}

fuzzy-dates-in-jekyll.html

{% for post in site.posts %}
  {% assign prevDate = post.prev.date | date: '%s'  %}
  {% assign thisDate = post.date | date: '%s'  %}
  {% assign prevDateDiff = thisDate | minus: prevDate | divided_by: 86400 %}
  
  {% if forloop.index != 1 %}
    This post was written {% include fuzzy-date.html dayDiff=prevDateDiff label='after' %} the last.
  {% endif %}
  
{% endfor %}