diff --git a/build/gulpfile.reh.ts b/build/gulpfile.reh.ts
index b935764033e..27149338d9f 100644
--- a/build/gulpfile.reh.ts
+++ b/build/gulpfile.reh.ts
@@ -321,7 +321,7 @@ function packageTask(type: string, platform: string, arch: string, sourceFolderN
 
 		let productJsonContents = '';
 		const productJsonStream = gulp.src(['product.json'], { base: '.' })
-			.pipe(jsonEditor({ commit, date: readISODate(sourceFolderName), version }))
+			.pipe(jsonEditor({ commit, date: readISODate('out-build'), version }))
 			.pipe(es.through(function (file) {
 				productJsonContents = file.contents.toString();
 				this.emit('data', file);
diff --git a/build/gulpfile.vscode.ts b/build/gulpfile.vscode.ts
index 7f5138166fe..92ae01fd01c 100644
--- a/build/gulpfile.vscode.ts
+++ b/build/gulpfile.vscode.ts
@@ -370,7 +370,7 @@ function packageTask(platform: string, arch: string, sourceFolderName: string, d
 
 		let productJsonContents: string;
 		const productJsonStream = gulp.src(['product.json'], { base: '.' })
-			.pipe(jsonEditor({ commit, date: readISODate(out), checksums, version }))
+			.pipe(jsonEditor({ commit, date: readISODate('out-build'), checksums, version }))
 			.pipe(es.through(function (file) {
 				productJsonContents = file.contents.toString();
 				this.emit('data', file);