Gnomon MCP server

Gnomon is a small helper that gives your AI assistant real tools for dates, arithmetic, and unit conversion. Instead of guessing, your AI asks this helper to actually compute the answer. It is handy for anyone who works with numbers, deadlines, or measurements in their daily tasks.

What this MCP server does

You ask your AI something like how many days until a deadline, or what 15 percent of a number is. Your AI passes that request to Gnomon. Gnomon does the actual calculation in Python, which is a programming language good at math and dates. Then it sends the exact answer back, and your AI shows it to you in the chat. You can also send a whole list of calculations at once and get a list of answers back in order.

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What you can do with it

• Get the current date and time with lots of detail like week number and quarter
• Count days between two dates or until a future date
• Add days, months, or years to a date
• Find out what day of the week a date falls on
• Count business days between two dates
• Evaluate math expressions like square roots, averages, and sums
• Convert units like kilograms to pounds or Celsius to Fahrenheit

Try asking your AI

• “How many days are left until December 31?”
• “What day of the week is May 25, 2026?”
• “Convert 75 kilograms to pounds”
• “What is the average of 12, 19, 24, and 31?”

What it gives back to you

You get back plain answers in the chat, like a number of days, a day name, or a converted value. If you asked for several things at once, you get a list of answers in the same order you asked. For the current time, you get a detailed snapshot with the date, time, week number, and more. Everything is computed exactly, not estimated.

Before you start

Who it's for

Anyone who deals with deadlines, schedules, measurements, or numbers in their work, like project managers, analysts, writers, and students.