Birthday and work anniversary messages are sent at 9 am based on your workspace's time zone setting. By default, messages for birthdays and work anniversaries that fall on a weekend are sent on the previous Friday. However, you can opt to deliver celebrations on the weekend by updating your settings. To do this, navigate to: Web App → Channel Settings → Celebrations → Celebrations Delivery

Each birthday and work anniversary will receive a banner to celebrate each person.

Slack and Microsoft Teams profile pictures will be used in the celebration message. Team members who don't have a profile picture will receive a banner without a profile picture.