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When accessing several pages from the internet, users are having an error of NET::ERR_CERT_DATE_INVALID.

The main cause of this problem, is because Windows 7 as per 14 Januari 2020 is no longer have a support from Microsoft. Since there are no longer support coming in, this affect the way win 7 connecting to internet, which is there are no SSL certificate updates.

SSL - Image source

Certificates are used to move HTTP to HTTPS, which making internet secure. All thing you type in and submit to a site will be encrypted using HTTPS. So when this certificate are no longer provided, the access for certain website will be reverted to HTTP mode, which is increasing your exposure your risk. 

So, to fix this problem you need to update the certificate to your computer manually.

  1. First you need to delete your old certificate from your computer. From your desktop, press Win + R button and type certmgr.msc.
  2. In the next step you will delete a certificate called R3 Certificate and DST ROOT CA X3. 
  3. Go to Trusted Root Certification Authorites > Certificates > Delete mentioned certificate above
  4. Go to Intermediate Certification Authorities > Certificates > Delete mentioned certificate above
  5. Go to Third-Party root Certification Authorities > Certificates > Delete mentioned certificate above
  6. After done deleting, click this let's encrypt cert link. This will download a new certificate to your computer.
  7. Double click that downloaded cert, Choose local machine > next Place all Certificates in the following store > and then select Trusted Root Certification Authorities folder.
  8. Restart your computer. 
This will fix the NET::ERR_CERT_DATE_INVALID problem