CASB\CloudSOC investigate traffic can be from many different time zones and to act on it, it is necessary to understand what time zone the traffic is being reported in.
Investigate traffic is reported in the time zone that the user profile is set to.
You can find what the time zone is set to by clicking on the User ID (top right corner) > User Profile > Timezone.
The above settings applies to all the applications (INVESTIGATE, DETECT, ..etc) except "AUDIT" which has a different Timezone settings (Settings > General > Timezone)