FreeBSD 13 source code using git clone fails

Hi,

Im trying to get the source code, for FreeBSD 13 release. I did:

# cd /usr
# git clone -b releng/13.0 https://git.freebsd.org/src.git src
Cloning into 'src'...
fatal: unable to access 'https://git.freebsd.org/src.git/': SSL certificate problem: certificate is not yet valid

or

# git clone -o freebsd https://git.FreeBSD.org/src.git src
Cloning into 'src'...
fatal: unable to access 'https://git.FreeBSD.org/src.git/': SSL certificate problem: certificate is not yet valid

!? I have ca_root_nss installed version 3.63 … Anything I need to know, or am I doing something wrong?

Thanks,
Stefan