From 848b6dcef317055d9d2b49c2793547639b9ee2ac Mon Sep 17 00:00:00 2001
From: vcoppe <vianney.coppe@gmail.com>
Date: Fri, 7 Feb 2025 18:13:46 +0100
Subject: [PATCH] catch invalid dates on export, closes #180

---
 gpx/src/io.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gpx/src/io.ts b/gpx/src/io.ts
index 9f4a264c..f20a7046 100644
--- a/gpx/src/io.ts
+++ b/gpx/src/io.ts
@@ -96,14 +96,19 @@ export function parseGPX(gpxData: string): GPXFile {
 export function buildGPX(file: GPXFile, exclude: string[]): string {
     const gpx = file.toGPXFileType(exclude);
 
+    let lastDate = undefined;
     const builder = new XMLBuilder({
         format: true,
         ignoreAttributes: false,
         attributeNamePrefix: '',
         attributesGroupName: 'attributes',
         suppressEmptyNode: true,
-        tagValueProcessor: (tagName: string, tagValue: unknown): string => {
+        tagValueProcessor: (tagName: string, tagValue: unknown): string | undefined => {
             if (tagValue instanceof Date) {
+                if (isNaN(tagValue.getTime())) {
+                    return lastDate?.toISOString();
+                }
+                lastDate = tagValue;
                 return tagValue.toISOString();
             }
             return tagValue.toString();