Well the idea is that the sun is opposite of your location at 24/12 pm. That way when someone gives you a number, you can have an idea of the lighting situation and such. I do agree that it be better for everyone to be on the same time though. The only issue there is that only one location will have a date/time correspondence with the rotation of the earth. Some places will change the date during the middle of the day. 24 hours will could be any time.
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I understand that. I'm looking at this from a logistical perspective.