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Almost all servers ask for your timezone when hiring. The main reason for this is to tell if you will be available to work at the times they need people there. It does little good to have someone that makes things for a server when the dev staff never sees them to discuss things. Timezones alone though don't tell you as much as asking when their average play time is. So instead why not tell them what time you are normally online based off GMT. They can convert that to their time simply enough through googling GMT.