...that way everyone would automatically know what time zone to use rather than memorizing where each GM lives
Why we need this?
Simply deliver the time and the timezone of the time of an event...
If the GM want to deliver the time of the event in GMT: OK. Fine. But there will always be people who have to calculate.
So simply add the Timezone of your time you gave for the event and everyone is set.
Because everyone can use this converter...