Rainbow TLS check, failure

We changed our WebRTCgateway server for failure (was 1.75.version), actually version installed in new WebRTCgateway server is 1.77.version, but appear this report:

Rainbow TLS check ...
depth=0 OU = Domain Control Validated, OU = Gandi Standard Wildcard SSL, CN = *.openrainbow.com
verify error:num=9:certificate is not yet valid
notBefore=Dec 12 00:00:00 2019 GMT
notBefore=Dec 12 00:00:00 2019 GMT
CONNECTION ESTABLISHED
Protocol version: TLSv1.2
Ciphersuite: ECDHE-ECDSA-AES256-GCM-SHA384
Peer certificate: OU = Domain Control Validated, OU = Gandi Standard Wildcard SSL, CN = *.openrainbow.com
Hash used: SHA256
Verification error: certificate is not yet valid
Supported Elliptic Curve Point Formats: uncompressed:ansiX962_compressed_prime:ansiX962_compressed_char2
Server Temp Key: X25519, 253 bits
DONE
[FAILED] 20180121-153533 Rainbow TLS check to openrainbow.com is -NOT- OK 200