The author shares a hands-on experience with an AI, Claude, which struggles with understanding the current date and managing calendar events. The initial task involved running the `date` command to find the current week and checking the calendar for scheduled workdays and meetings. Claude misinterpreted the date, listing events for January 13 instead of January 12, leading to frustration. The author identifies this as a failure in the AI’s date math abilities and sets out to solve the problem. To address the errors, the author first prompts Claude to explain what went wrong. Claude realizes it used the wrong date range in its command for gcalcli. Recognizing that the AI's weaknesses in date calculations can be mitigated through programming, the author instructs Claude to create a script that calculates the week’s start and end dates. After some trial and error, including fixing issues with the script, the author guides Claude to update its internal instructions to rely on the new script instead of its flawed logic. The final step involves clearing Claude's memory of previous methods, ensuring it only retains the correct approach moving forward. The author emphasizes the importance of determinism in programming AI, pointing out that while Claude struggles with certain calculations, it excels at writing code. With proper guidance, the AI continually improves, demonstrating a productive partnership between human input and AI capabilities.