I don't know why they wouldn't fix the timezone, Summer time is ended and having the game that is one hour ahead of us makes just things a bit complicated, arenas and dredgions open before and they may grab people bussy or at work, if they keep having Summer time, then schedule would be like this:
Sieges
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Frist Tiamaranta Siege: 1pm - 2pm
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Lower Abyss Siege: 3pm - 4pm
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Second Tiamaranta Siege: 4pm - 5pm
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Gelkmaros / Inguisson: 7pm - 8pm
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Upper Abyss - Katalam/Danaria: 9pm - 10 pm
Arenas
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Dredgion: 11 pm - 01 am
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Chantra dredgion: 1pm - 2pm
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Therath Dredgion: 7pm - 9pm
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Orphidean Bridge: 1pm - 2pm / 6 pm - 8 pm
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Kamar Battlefield: 8pm - 9pm
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Steel Wall Bastion PVP: 11pm - 1am
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Arenas: 11am - 1pm / 5pm - 11pm
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Arena of Glory: 7pm - 9pm