Using |date_modify filter

Here is an example of using the |date_modify filter to add or subtract units of time from dates.

• automation
• output

• start:
    return:
      output@text:
        {% set format = 'D, d M Y T' %}
        {% set timestamp = date('2025-06-15') %}
        At: {{timestamp|date(format)}}
        +2 days: {{timestamp|date_modify('+2 days')|date(format)}}
        -1 week, 3 days: {{timestamp|date_modify('-1 week, -3 days')|date(format)}}

• __return:
    output: |-
      At: Sun, 15 Jun 2025 PDT
      +2 days: Tue, 17 Jun 2025 PDT
      -1 week, 3 days: Thu, 05 Jun 2025 PDT