Update questionnaireEngine.ts

CovOpen · Apr 19, 2021 · c05bdeb · c05bdeb
1 parent b0e598e
commit c05bdeb
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/covquestions-js/src/questionnaireEngine.ts b/covquestions-js/src/questionnaireEngine.ts
@@ -365,7 +365,7 @@ export class QuestionnaireEngine {
  dateFormat?: LogicExpression
  ): string {
  if (!timestamp || !dateFormat) {
- return "";
+ return null;
  }
  const timestampInMilliseconds = parseInt(timestamp.toString()) * 1000;
  return dayjs(timestampInMilliseconds).format(dateFormat.toString());