Скачать или смотреть Fixing NaN Error When Formatting Dates in Angular on iOS

Struggling with the `NaN` error when displaying dates in your Angular application on iOS devices? This guide offers a step-by-step solution to fix date formatting issues in your Progressive Web App.
---
This video is based on the question https://stackoverflow.com/q/67626685/ asked by the user 'Cookes' ( https://stackoverflow.com/u/7696848/ ) and on the answer https://stackoverflow.com/a/67654037/ provided by the user 'Cookes' ( https://stackoverflow.com/u/7696848/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Angular date pipe shows NaN on iphone/ios after formatting date

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Fixing NaN Error When Formatting Dates in Angular on iOS

If you’re developing a Progressive Web App (PWA) using Angular and Ionic, you might encounter a frustrating issue: the date and time of events display as NaN on iOS devices, causing headaches for both developers and users alike. In this guide, we’ll explore why this problem occurs and how to solve it effectively, ensuring your app works smoothly across all platforms.

The Problem: Why Do Dates Show as NaN?

When running your PWA on an iOS device, you may notice that dates retrieved from your backend server appear as NaN. This error means that the Angular date pipe is unable to interpret the date string correctly. The error message typically reads:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that the format used to represent the date is incompatible with the JavaScript Date object, especially on certain platforms like iOS.

The Source of the Issue

The problem lies in the way the date is formatted when it is fetched from the backend. If the date string, such as "2021-05-19 17:15:38", is not in an ISO format, the new Date() constructor may fail, leading to the dreaded NaN output.

The Solution: Formatting the Date Correctly

To fix this issue, you need to adjust the string representation of the date before passing it to the Date object in your Angular application. The key is to replace the space in the date string with a T, converting it from "yyyy-MM-dd HH:mm:ss" to "yyyy-MM-ddTHH:mm:ss", which is a recognized format in JavaScript.

Step-by-Step Fix

1. Modify the formatAMPM Function

You will need to add a line to replace the space with a T in your formatAMPM function. Here’s how the modified function would look:

[[See Video to Reveal this Text or Code Snippet]]

2. Test on iOS Device

After implementing this change, ensure that you test your application on an iOS device or the browser's iOS simulator. Check if the dates now display correctly without any NaN issues.

Conclusion

Addressing the NaN error in date formatting for Angular applications running on iOS is a straightforward fix—simply adjusting the format of the date string can make all the difference. This solution will ensure your events display correctly on all devices, enhancing the user experience of your PWA.

Feel free to reach out with any further questions or problems related to Angular, and don’t forget to share this guide with fellow developers facing similar challenges. Happy coding!