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catamphetamine · Feb 15, 2023 · ab6b8a2 · ab6b8a2
1 parent 863ea02
commit ab6b8a2
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Showing 3 changed files with 6 additions and 3 deletions.
diff --git a/package-lock.json b/package-lock.json
diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "read-excel-file",
-  "version": "5.6.0",
+  "version": "5.6.1",
   "description": "Read small to medium `*.xlsx` files in a browser or Node.js. Parse to JSON with a strict schema.",
   "module": "index.js",
   "main": "index.cjs",

diff --git a/source/read/isDateTimestamp.js b/source/read/isDateTimestamp.js
@@ -14,9 +14,12 @@ export default function isDateTimestamp(value, styleId, styles, options) {
     if (!style) {
       throw new Error(`Cell style not found: ${styleId}`)
     }
+    if (!style.numberFormat) {
+      return false
+    }
     if (
       // Whether it's a "number format" that's conventionally used for storing date timestamps.
-      BUILT_IN_DATE_NUMBER_FORMAT_IDS.indexOf(parseInt(style.numberFormat.id)) >= 0 ||
+      BUILT_IN_DATE_NUMBER_FORMAT_IDS.indexOf(Number(style.numberFormat.id)) >= 0 ||
       // Whether it's a "number format" that uses a "formatting template"
       // that the developer is certain is a date formatting template.
       (options.dateFormat && style.numberFormat.template === options.dateFormat) ||