diff --git a/lib/DayCalculator.dart b/lib/DayCalculator.dart
new file mode 100644
index 0000000..9be8f0a
--- /dev/null
+++ b/lib/DayCalculator.dart
@@ -0,0 +1,10 @@
+// Based on this article:
+// https://artofmemory.com/blog/how-to-calculate-the-day-of-the-week-4203.html
+
+class DayCalculator {
+  // Calculates (YY + floor(YY / 4)) % 7
+  static int getYearValue(int year){
+    var yy = year % 100;
+    return (yy + (yy / 4).floor()) % 7;
+  }
+}
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