Caching data in a web-app?

I have a web-app that has a user dashboard. The dashboard must display their "today" items, such as "appointments today" However as they work through appointments if i re-query the DB this number will get smaller and smaller. What would be the best way to get daily data, and i assume cache it such that the value will not change throughout the day?
HADDADD3Asked:
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Carl TawnConnect With a Mentor Systems and Integration DeveloperCommented:
Why are you losing them when you query? Are they being marked as completed, or something along those lines, or are you simply querying with a date that includes a time element, rather than from midnight of the current day?
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