# CesiumJS web server won't open with the following error: =\>ERR\_CERT\_DATE\_INVALID

**URL:** <https://community.cesium.com/t/cesiumjs-web-server-wont-open-with-the-following-error-err-cert-date-invalid/18529>\
**Category:** CesiumJS\
**Created:** [May 11, 2022, 4:43am UTC](https://community.cesium.com/t/cesiumjs-web-server-wont-open-with-the-following-error-err-cert-date-invalid/18529 "2022-05-11T04:43:57Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jinwou.choi](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/jinwou.choi/32/9221_2.png) [@jinwou.choi](https://community.cesium.com/u/jinwou.choi)\
**Post date:** [May 11, 2022, 4:43am UTC](https://community.cesium.com/t/cesiumjs-web-server-wont-open-with-the-following-error-err-cert-date-invalid/18529/1 "2022-05-11T04:43:57Z")

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on chrome, MAC

 ![스크린샷 2022-05-11 오후 1.43.25](https://global.discourse-cdn.com/cesium/original/2X/2/2f4328b638284d313a34a47cd8c08c82cd217157.png)

How to fix NET::ERR\_CERT\_DATE\_INVALID error on mac?

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**Author:** ![Jessica\_Howe](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/jessica_howe/32/28510_2.png) [@Jessica\_Howe](https://community.cesium.com/u/Jessica_Howe)\
**Post date:** [March 11, 2025, 9:14am UTC](https://community.cesium.com/t/cesiumjs-web-server-wont-open-with-the-following-error-err-cert-date-invalid/18529/2 "2025-03-11T09:14:34Z")

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To fix these error, you can solve the issue by following the article at:- [https://certera.com/kb/how-to-fix-the-neterr-cert-date-invalid-error/](https://certera.com/kb/how-to-fix-the-neterr-cert-date-invalid-error/). May it will be useful.

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**Author:** ![maicaela](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/maicaela/32/28173_2.png) [@maicaela](https://community.cesium.com/u/maicaela)\
**Post date:** [April 3, 2025, 11:53am UTC](https://community.cesium.com/t/cesiumjs-web-server-wont-open-with-the-following-error-err-cert-date-invalid/18529/3 "2025-04-03T11:53:11Z")

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The error has been faced on Chrome MAC, and the CesiumJS server won’t open with the following error it can happen due to a problem with the validity period of the SSL certificate, which could be because it has expired or isn’t yet valid. This issue typically occurs due to – incorrect system date and time settings on the user’s end.

I was also facing such an error while using my Chrome browser, and to solve it, I found the solution from the following blog:- [https://cheapsslweb.com/resources/how-to-fix-net-err\_cert\_date\_invalid-error-on-google-chrome](https://cheapsslweb.com/resources/how-to-fix-net-err_cert_date_invalid-error-on-google-chrome). So, following the different methods the error get solved.