On a sunny day (Sun, 16 Feb 2020 15:05:41 +0000) it happened Adam Funk
 wrote in :

>I want the cron.daiy jobs to run earlier in the morning than they do
>by default.  I used to do this by editing the time in
>/etc/cron.d/anacron, but that no longer works; nor does changing the
>time in the cron.daily line of /etc/crontab.  How is this controlled
>now?
>
>Thanks

Not sure your buster is same as my buster as I modify things from install time
onwards,
but
as root in /root I edit:
 crtab

to make any changes,
then run
 crontab crtab

In my crtab it says for daily:

#MIN    HOUR    DAY MONTH   DAYOFWEEK   COMMAND
# Run daily cron jobs at 4:40 every day:
40 4 * * * /usr/bin/run-parts /etc/cron.daily 1> /dev/null

So changing 40 4 * * * to say 40 3 * * *
should run daily stuff at 3 o'clock.

Again I copied crtab from my other systems so maybe it is different on your
system.

Finally run
 crontab -l
to see if you made any typos.

In my crtab there are now many enries for things that need happening at
different times,
thing is on 24/7
AFAIK this has been the Unix way for many decennia.

--- SoupGate-Win32 v1.05