Sommartid = summer daylight savings time
This happened in the fall- Swedish time changed about a week after the U.S. We can't tell you how often this messed up our calendar for a bit. We're used to being 6 hours ahead of the east coast and 9 for the west coast, and now we're 5 and 8 (but just for a few weeks). I have colleagues on a project in Arizona- no idea what time it is there.
Last year, the EU voted to scrap the seasonal time change in 2021. Two-thirds of Swedes are apparently in favor of scrapping daylight savings, though the news report says that it is unclear whether they'd pick "winter" time or "summer." I have a guess. Swedish dissatisfaction may be bolstered by a recent study indicating a 6.7% increase in the risk of heart attack for Swedes in the 3 days following the time change.
We will note that the days are already getting much, much longer: sunrise at 6:20 AM, sunset at 17:36 PM (total hours of daylight 11 hours, 16 minutes).
Anyway, for now, forgive us if we are not quite sure what time it is.