1 files changed, 12 insertions, 1 deletions
diff --git a/app/assets/javascripts/lib/utils/datetime/date_calculation_utility.js b/app/assets/javascripts/lib/utils/datetime/date_calculation_utility.js
index 6484fcff769..9bb2884e065 100644
--- a/app/assets/javascripts/lib/utils/datetime/date_calculation_utility.js
+++ b/app/assets/javascripts/lib/utils/datetime/date_calculation_utility.js
@@ -401,6 +401,8 @@ export const nWeeksBefore = (date, numberOfWeeks, options) =>
 
 /**
  * Returns the date `n` years after the date provided.
+ * When Feb 29 is the specified date, the default behaviour is to return March 1.
+ * But to align with the equivalent rails code, moment JS and datefns we should return Feb 28 instead.
  *
  * @param {Date} date the initial date
  * @param {Number} numberOfYears number of years after
@@ -408,7 +410,16 @@ export const nWeeksBefore = (date, numberOfWeeks, options) =>
  */
 export const nYearsAfter = (date, numberOfYears) => {
   const clone = newDate(date);
-  clone.setFullYear(clone.getFullYear() + numberOfYears);
+  clone.setUTCMonth(clone.getUTCMonth());
+
+  // If the date we are calculating from is Feb 29, return the equivalent result for Feb 28
+  if (clone.getUTCMonth() === 1 && clone.getUTCDate() === 29) {
+    clone.setUTCDate(28);
+  } else {
+    clone.setUTCDate(clone.getUTCDate());
+  }
+
+  clone.setUTCFullYear(clone.getUTCFullYear() + numberOfYears);
   return clone;
 };