diff --git a/lib/utils/utils.js b/lib/utils/utils.js
index 21dd20ee9..6b4afe143 100644
--- a/lib/utils/utils.js
+++ b/lib/utils/utils.js
@@ -57,6 +57,7 @@ const utils = {
     return 25569 + d.getTime() / (24 * 3600 * 1000) - (date1904 ? 1462 : 0);
   },
   excelToDate(v, date1904) {
+    if (!Number.isFinite(v)) return v; // dmjp: If v isn't actually a date, eg the cell style is a date format but the value isn't numeric, then return v instead of "Invalid Date".
     // eslint-disable-next-line no-mixed-operators
     const millisecondSinceEpoch = Math.round((v - 25569 + (date1904 ? 1462 : 0)) * 24 * 3600 * 1000);
     return new Date(millisecondSinceEpoch);