Free Calendar Dates

npx add-mcp 'https://free-calendar-dates-mcp.simpletonfacts.workers.dev/mcp'

FREE · NO KEY · REMOTE MCP

Free Calendar Dates MCP server

Give your AI assistant exact answers for dates people ask about all the time. It computes them from the official rules, with no API key and no sign-up.

Server URL (Streamable HTTP):

https://free-calendar-dates-mcp.simpletonfacts.workers.dev/mcp

Tools

• church_calendar_dates — Ash Wednesday, Palm Sunday, Good Friday, Easter Sunday, Ascension, Pentecost, Trinity Sunday and the First Sunday of Advent for a year (Western), plus Orthodox Easter (Gregorian date).
• us_federal_holidays — All US federal holidays for a year with the actual date and the observed date (Saturday holidays observed Friday, Sunday holidays observed Monday).
• next_us_federal_holiday — The next US federal holiday (by observed date) on or after a given date, and how many days away it is.
• us_daylight_saving_time — When US daylight saving time starts (clocks spring forward) and ends (clocks fall back) in a year.
• us_estimated_tax_due_dates — The four IRS Form 1040-ES quarterly estimated tax due dates for a tax year, moved to the next business day for weekends and legal holidays. Standard rules only; the IRS can postpone deadlines for disasters.
• golden_hour — Sunrise, sunset, morning and evening golden hour and blue hour for any place and date, for photography planning.

Connect

Claude: Settings → Connectors → Add custom connector → paste the URL above.
Claude Code:

claude mcp add --transport http free-calendar-dates https://free-calendar-dates-mcp.simpletonfacts.workers.dev/mcp

Cursor / other clients (mcp.json):

{ "mcpServers": { "free-calendar-dates": { "url": "https://free-calendar-dates-mcp.simpletonfacts.workers.dev/mcp" } } }

Same data as CSV, JSON and a static API: open datasets · JSON API · live badges.

Made by Honest Little Apps. Stateless, no logging of your questions, MIT licensed.