On 2019-07-18, Internet service providers in Kazakhstan began instructing their users to install a trusted root TLS certificate authority certificate from http://qca.kz/. These are the three certificate files available for download from that site. qazca.cer and qazca.pem are the same, except for filename.
The date comes from the certificate's "Not Before" field, which is Feb 2 05:41:00 2016 GMT. They were first reported seen on 2019-07-18. The HTTP Last-Modified header value for all three files was Fri, 12 Jul 2019 09:01:11 GMT.