The receipt you couldn't find on day 31

You bought it with good intentions. It didn't fit, or didn't work, or wasn't quite right. You meant to send it back, and then life got busy. When you finally dig out the receipt, the window closed last week. Return deadlines are easy to forget because they start ticking the day you buy.

Add each purchase with its date and the store's return window, and see what's due first. About two minutes. Your list stays in this browser.