Can I control the time of day that my group sends out the daily digest message?

I plan to use a new Yahoo group to send out a daily digest of news items. Only moderators can contribute news items, throughout the day. Most group members want to receive a single daily digest. Late in the business day is the best time for the digest to be sent out. But Yahoo groups sends it out in early morning, apparently by default. How can I set that time of day for the digest to go out?