Use one unified time for all game elements. This could be called Grepolis Time.
This can be the server time, UTC or any other offset. It would mean the removal of local time, and daylight savings. Daylight savings should also be removed from the server.
Have you Checked the 'Do not suggest list/previously suggested ideas' in the 'Archive'?
It should be there already.
A common time used by all players will help tremendously in coordinating attacks and defence. The current method of local time zone, plus daylight savings, leads to confusion, mistakes and is a totally unnecessary obfuscation of one of the fundamental mechanics of Grepolis play -Time.
Local time does not accommodate geographical variants for daylight savings. For example, Iceland is in the GMT time zone, but does not follow DST, so therefore the displayed time is wrong for half of the year for Icelanders.
The server follows DST, and makes coordination very difficult around the biannual clock changes at 02:00. To use Iceland as an example again, even a setting of UTC would mean the displayed time is wrong half of the year.
Player A who is in New Zealand (UTC+11) telling player B who is in the UK (UTC) that their colony ship arrives tomorrow at 12:30 PM can be completely ambiguous when daylight savings from each country are considered, and the fact that tomorrow may mean completely different weekdays for each player
All time displayed in game is unified to server time UTC.
Time zone settings are removed.
Daylight savings are removed from server.
Balance should remain unaffected.
No abuse vectors identified.
It seems common that alliances choose UTC+1 or server time for all of their coordination. This effectively makes any local time settings obsolete. The complete removal of time zones and daylight savings will prevent all ambiguity during game play, and should also make the developers job easier by streamlining scripts for offset calculations, and reduces the chance of bug introduction.