Date Calculator

live Utility

Difference between dates, add/subtract durations (month-end clamped), and calendar facts (weekday, ISO week, quarter, leap year). UTC, keyless, offline.

3 tools
0ms auth
free tier 50 calls/day

Tools

date_diff

Compute the difference between two dates/times (UTC). Returns the signed difference in ms, seconds, minutes, hours, days and weeks, plus a human-readable summary. Accepts ISO-8601 (e.g. "2026-01-01" o

No parameters required.

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add_duration

Add (or subtract, with negatives) a duration to a date and return the new UTC date/time. Provide any of years/months/weeks/days/hours/minutes/seconds.

No parameters required.

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date_info

Calendar facts about a date (UTC): weekday, day-of-year, ISO week number, quarter, whether the year is a leap year, and days in that month.

No parameters required.

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Test with curl

The gateway speaks JSON-RPC 2.0 over HTTP POST. You can test any pack directly from the terminal.

List available tools
bash 
curl -X POST https://gateway.pipeworx.io/datecalc/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
Call a tool
bash 
curl -X POST https://gateway.pipeworx.io/datecalc/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"date_diff","arguments":{}}}'

Use with the SDK

Install @pipeworx/sdk to call tools from any TypeScript/Node project.

TypeScript 
import { Pipeworx } from '@pipeworx/sdk';
const px = new Pipeworx();
const result = await px.call("date_diff", {});
ask_pipeworx 
// Or ask in plain English:
const answer = await px.ask("difference between dates, add/subtract durations (month-end clamped), and calendar facts (weekday, iso week, quarter, leap year)");