Dynamic date to work out how long I've been a designer

src/_data/dates.cjs

@@ -3,4 +3,11 @@ module.exports = {
     const today = new Date();
     return today.getFullYear();
   },
+  yearsSinceIBecameADesigner() {
+    const startDate = new Date('2011-09-01');
+    const currentDate = new Date();
+    const timeDiff = Math.abs(currentDate - startDate);
+    const yearsPassed = Math.floor(timeDiff / (1000 * 60 * 60 * 24 * 365));
+    return yearsPassed;
+  },
 };

src/_includes/layouts/about.njk

@@ -6,7 +6,7 @@ title: About
 <header class="flow | gap-x-large">
   {% include "components/nav.njk" %}
   <p class="measure">
-    I’ve been a designer and front-end engineer for more than 10 years.
+    I’ve been a designer and front-end engineer for more than {{ dates.yearsSinceIBecameADesigner() }} years.
     I started out as a Graphic Designer, around 2014 I transitioned to Product Design.
     Since then I have worked with clients of all sizes in many different industries.
   </p>

src/index.njk

@@ -17,7 +17,7 @@ title: Product Designer
     Digital product designer, design director, and user experience engineer for
     <a href="https://www.thoughtbot.com">thoughtbot</a>.
     Specialising in design strategy, process, and systems across
-    multiple industries for more than 10 years.
+    multiple industries for more than {{ dates.yearsSinceIBecameADesigner() }} years.
   </p>
 </header>