Just know that it is going to reset on the Tuesday or Thursday after the date listed. If they did it on the 30th, which was when we had the Thursday maintenance for that week, people would have been like... "Oh no! I forgot to do the exchange! Woe is me! I have 4 Life crystals but I could have easily farmed 1,000 today but the developers went ahead and reset the shop on me! Disregard the fact that even if I had the extra four days I would have forgotten to do it anyway! They reset the shop early and now my entire life is ruined.... *dies from sadness*..."

Just keep working at it until you can fully knock out the shop the day it resets so you don't have to worrying about it, and if you happen to forget after the maintenance, you have a full month to force yourself to do it. I did mine about one minute after the maintenance ended on Tuesday (after I did a quick garden capture and gather since those are usually waiting on me).