[CentOS-devel] a problem with "ca-certificates" rpm?

hi guys,

Anything I try to do with dnf and outside what 'centos', eg. adding a
gluster repo or any third-party repo I get:

...

[MIRROR] rdo-release.rpm: Curl error (60): Peer certificate cannot be
authenticated with given CA certificates for
https://rdoproject.org/repos/rdo-release.rpm [SSL certificate problem:
certificate is not yet valid]
[FAILED] rdo-release.rpm: Curl error (60): Peer certificate cannot be
authenticated with given CA certificates for
https://rdoproject.org/repos/rdo-release.rpm [SSL certificate problem:
certificate is not yet valid]

...

Any ideas, suggestions on why centos is not happy that way?

many thanks, L.

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