Hey, its 00:41 here in sweden now, but my timer still shows the time from yesterday. I thought it was supposed to reset at midnight 00:00. Is there something wrong? I checked the timer in the accounts settings and it shows the correct swedish time. But why has it not reset?

The timer doesn't reset until 04:00 on the next day. So any study time accumulated between 00:00 and 04:00 will count toward the previous day. This is by design. It's quite common for people to stay up past midnight before going to bed. So the system assumes that the new day really starts when you wake up. Hope that clears things up a bit!