Hi Barabara,
At the moment, this is not possible. Although, it would be good to have a capability to build segments based on specific hour/day/week/month, etc.
One way, which may be a bit of a stretch is to use getTimeParting plugin. This basically captures the 'hour of the day', and 'day of the week' into a prop and this can be used to build segments and analyze your traffic.
You can read it here: https://marketing.adobe.com/resources/help/en_US/sc/implement/getTimeParting.html
This blog talks about it a bit as well: https://blogs.adobe.com/digitalmarketing/analytics/plug-ins-inside-omniture-sitecatalyst/
-Hyder