Depends on your goal. Many on this website try to buy at bottoms and sell (go to 100% G) at tops.
Your case sounds as if this is the allocation you would like to go with for a longer time frame in which case it won't make one bit of difference when you do it. It's really nothing more than an arbitrary re-balancing. If you do it today before noon, you get today's closing price. If you do it after noon, then you get tomorrow's closing price.
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