is this date?
[root@desk mythcat]# koji list-builds --package=kernel --after="2021-07-01"
Build Built by State
------------------------------------------------------- ----------------
----------------
kernel-5.14.0-0.rc0.20210701gitdbe69e433722.6.eln112 jforbes COMPLETE
kernel-5.14.0-0.rc0.20210701gitdbe69e433722.6.fc35 jforbes COMPLETE
kernel-5.14.0-0.rc0.20210702git3dbdb38e2869.6.eln112 jforbes FAILED
kernel-5.14.0-0.rc0.20210702git3dbdb38e2869.6.fc35 jforbes FAILED