I think "path of least resistance" for you would be just making everyone download and use AddonTools. Put it in the guild message or something, it's next to no effort at all and benefit would be great.
Another tip is to use an in-game event (AOD for example) and setup the meeling like "1h before first AOD" since its time is localized for each player.
Or make a guild site with the event listed, with a count down and stuff like that.
Although, I think an option to check the server time in the game, without an addon, is a must.
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