MAC Help Needed

LINK https://support.apple.com/en-us/HT202663

This may sound like a stupid question, but are the calendar and clocks correct on your computer?

Time and date are correct now...

I've done all there is to do aside from a time machine situation. The WiFi icon at the top says it's connected, but Safari and the App Store won't connect...

Did anyone change anything with WiFi router or wireless network? Or maybe router had an automatic firmware update that changed something.

I know you mentioned other computers connected as usual, but I was just wondering. Some can be set up for an access control that blocks internet access but still allows connection for local network access.
Like below

quote:

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Use the access control feature to block devices from connecting to your router’s Internet connection.
Note: Blocking devices with access control only blocks them from accessing the Internet. Devices can still access your router’s local network and communicate with your connected devices.

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https://kb.netgear.com/24830/How-do-I-use-access-control-to-allow-or-block-devices-from-accessing-the-Internet-on-my-Nighthawk-router

This is on top of other parental controls and so on that can be set up to limit internet access.

Are there any other WiFi networks nearby you can connect to and just make sure computer still can connect to Internet using WiFi?