MCP For Claude Marketplace
Deterministic Datetime Engine

Deterministic Datetime Engine MCP Connector for Claude

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Equip your AI with exact temporal math. Deterministically calculate date differences, leap years, and add business days (skipping weekends) 100% locally.

3 tools Official Updated Jun 28, 2026 Official Vinkius Partner
More Details Connect to Claude

Language Models are infamously bad at calendar math. If you ask an AI to "Add 45 business days to October 12th", it will almost always guess wrong because it cannot programmatically skip weekends and account for varying month lengths. The Datetime Operations MCP solves this by offloading temporal calculations to a strict V8 Javascript engine.

The Superpowers

  • Business Day Math: Add or subtract days while perfectly skipping Saturdays and Sundays. Essential for SLA calculations, billing cycles, or delivery estimates.
  • Exact Date Differences: Need to know exactly how many days, months, or years passed between two dates? Stop guessing and get mathematically perfect totals instantly.
  • Leap Year Logic: Flawlessly implements the Gregorian leap year algorithm (% 4 == 0 && % 100 !== 0).
  • Privacy First (Local): Executes completely locally. Zero API latency.
temporal-mathdate-calculationbusiness-logicv8-enginelocal-processingcalendar-automation

3 tools expose this connector's capabilities to your AI agent.

add_business_days

Adds or subtracts a specific number of business days (skipping weekends) from a given date

calculate_date_difference

Calculates the exact mathematical difference between two dates in days, months, and years

check_leap_year

Checks if a specific year is a leap year using the exact Gregorian calendar algorithm

See how to talk to your AI agent using Deterministic Datetime Engine.

Calculate the deadline: Add 15 business days to 2024-10-01.

Using the add_business_days tool: The final date is 2024-10-22.

Exactly how many days passed between 2020-01-01 and today?

Using the calculate_date_difference tool: Exactly 1568 days (or 4 years and 3 months) have passed.

AI models predict tokens, they don't "compute" calendars. When crossing months (e.g., February 28th to March 1st) or calculating Business Days, LLMs hallucinate dates frequently. This MCP forces exact algorithmic execution.

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