Time in which game unlocks

[Liag]

Swedish time is always GMT+1, as Britain and Sweden have the same DST dates. GMT always includes DST.
You're probably thinking of UTC, which is the actual international standard for time derived from GMT, and changes with DST.

I'm assuming the info provided here http://www.timeanddate.com/worldclock/city.html?n=239
is correct.

No, as the site mistakes GMT for UTC (a common, but still incorrect usage). GMT is simple the current time in Britain and some other countries in that time zone. It was depracated as the international standard in favour of UTC 30 years ago. When people write "GMT+1" they usually mean "UTC+2".