Comment # 2 on bug 1080490 from Achim Gratz

I went for this incantation in /usr/lib/cron/run-crons:

                        # run as usual   
                        else
                          TIME="-cmin +$((1 + ($($DATE +%s)-$($DATE -d today'
'${CRON_DAILY_NOT_BEFORE:-04:00} +%s))/60))" 
                        fi ;;
          cron.weekly)  TIME="-cmin +10080 -or -cmin 10080"  ;;

DATE is defined so that it can be switched to use UTC or the local timezone by
a sysconfig variable and CRON_DAILY_NOT_BEFORE should also be a sysconfig
variable.