I tried accessing the internet and all https based sites got an invalid certificate warning. (MOZILLA_PKIX_ERROR_NOT_YET_VALID_ISSUER_CERTIFICATE in firefox or DLG_FLAGS_SEC_CERT_DATE_INVALID in edge). Looking at the certificate, I found the following information.
Common Name: www.google.com
Issuer name: ESET SSL Filter CA.
Valid: 12/20/2019, 2:13:44 PM - 3/13/2020, 2:13:44 PM (Central European Standard Time) [this includes the current date/time]
Certificate Authority: No [Looks suspicious to me]
About system time: My system clock is at 20 jan 2020, which is correct