The Voxy Command Center displays data in the UTC time zone. Note that depending on the timezone that the learner is currently in, they may see slightly different engagement data in their account.
For example, if a learner is in the EST time zone, this means that it he/she is 5 hours behind UTC. Any time on task spent starting on 7pm EST time on a given day, will be displayed in the Voxy Command Center as work completed in the following day, as it considers that it is past midnight.
Voxy recommends extending the date range by one day in the date filter when verifying learner compliance with requirements, as it may have a slight impact if learners are studying several hours towards the end of the last day.