Let me explain how Clarizen works with dates and time.
Let say you insert a work item with some "start date". We do the following:
- Convert the date/time to your timezone. It may change the date to the previous day or to the next day.
- Adjust the date/time to the beginning of a working day according to the calendar. For the "due date" we adjust to the end of a working day. This also may change the date.
- Convert it to UTC (aka GMT)
So in your case for start date you should see time as 13:00:00 and the due date as 21:00:00 which is 8 am and 4 pm in your time zone.