If you see Due or Start dates and times showing differently to what you expect the first question is “Are you syncing with Google Calendar?”

Check this in your account settings More info here

First check your Dooster and Google timezone settings match (more info)

If they do then the problem is almost certainly the ongoing issue at Google’s end. (For more on this please see My Tasks Added in Google aren’t Sycning (scroll down that page a bit).

To solve it disable your Google Calendar sync first and the problem should go away (leave it for a couple of days to be sure). Assuming the problem has gone away, then you can resync BUT make sure to check your timezones match ie Google and Dooster.