Chrome Version       : 51.0.2704.79 (Developer Build) Ubuntu 14.04 (64-bit)
URLs (if applicable) : e.g. https://expired.badssl.com/
Other browsers tested:
  Add OK or FAIL, along with the version, after other browsers where you
have tested this issue:
     Safari:
    Firefox: OK
         IE:

What steps will reproduce the problem?
(1) Launch Chromium
(2) Go to https://expired.badssl.com/ (or any other webpage with expired ssl-certificate)

What is the expected result?

An error code that hints me to the fact that the certificate is expired.

What happens instead?

The displayed error code is NET::ERR_CERT_DATE_INVALID, which can lead to the thought, that there is a date in the certificate which is an invalid date, whereas the certificate has just expired.

Please provide any additional information below. Attach a screenshot if
possible.

Firefox for example show the error code SEC_ERROR_EXPIRED_CERTIFICATE together with the actual expiration date and the current system time/date.