Question

89

TypeError: formats.dateTimeString.toISOString is not a function

rated 0 times [ 95] [ 6] / answers: 1 / hits: 21346 / 9 Years ago, sat, august 22, 2015, 12:00:00

I'm new to TypeScript and AngularJS, and I'm trying to convert a date from my API that is something like:

8/22/2015

...to an ISO Date. The date is properly deserialized into a TypeScript property of type Date. However, when I try the following command (in typescript, and this.dateDisplay is of type string)

this.dateDisplay = formats.dateTimeValue.toISOString();

I get the error:

TypeError: formats.dateTimeValue.toISOString is not a function
at dataFormatsTests.js:42
at processQueue (angular.js:14567)
at angular.js:14583
at Scope.$get.Scope.$eval (angular.js:15846)
at Scope.$get.Scope.$digest (angular.js:15657)
at Scope.$get.Scope.$apply (angular.js:15951)
at done (angular.js:10364)
at completeRequest (angular.js:10536)
at XMLHttpRequest.requestLoaded (angular.js:10477)

I've also been to this site and it says my browser supports the toISOString function.

So, my questions is: Why doesn't my browser, or angular, or whatever, recognize the toISOString function?

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micheleb

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4 Years ago

answered 9 Years ago byrondonavanc · Accepted Answer

Although the dateTimeValue was defined as a Date in TypeScript, it was being instantiated at runtime as a string because it was being pulled from the API. Therefore, the TypeScript would compile just fine, but when the javascript ran it was seeing .toISOString() being called against a string, not a Date.