The default time zone on INASP Moodle is GMT (also known as UTC). The time mentioned by the course moderator or facilitator for activity deadlines (such as 11 PM) is usually GMT.
To see deadlines in your local time zone on the course calendar, check/edit your profile and change the time zone in the "timezone" field. You may also want to add a reminder about the deadline on your phone or computer.
It is your responsibility to make sure that you have noted the deadlines in the correct time zone. To be on the safe side don't put off your work until the last minute!