cURL error 60 on Calendar module

i’ve installed Caledar module on FreePBX, the module version is .
I cannot load any external iCal Calendar because of this error:

URL error 60: The certificate issuer’s certificate has expired. Check your system date and time.

But, date and time of server are sets correctly, and curl works at shell cli.
I’ve already read about this problem, but i’ve not found a solution.
Cann anyone help me?

It’s probably not the computer, but the certificate. You can verify the content of the certificate with openssl x509 -in -noout -text, or so.

Seems that the certificate is valid.
Schermata da 2022-08-29 16-37-59
However, can you explain to me the exactly procedure to follow?

There should inspect the following dates:

Not Before: Feb 24 10:18:09 2022 GMT
Not After : Feb 24 10:18:09 2032 GMT

Schermata da 2022-08-29 16-59-02

Was that the “certificate issuer”?

It would seem so …

Can anyone help me? I’ve downloaded the calendar also from other website (with SSL ok), but it doesn’t work anyway.