Date difference API: days, weeks and weekdays between two dates

$0.01 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

Time between two dates or timestamps: total days, weeks, hours, minutes and seconds, a years-months-days breakdown, and the number of weekdays (Monday-Friday) in between. Use for deadlines, ages and durations.

When to use it

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Try it with your own inputs

Start date or ISO timestamp
End date or ISO timestamp

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
from (required)stringStart date or ISO timestamp
to (required)stringEnd date or ISO timestamp

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/date/diff?from=2026-01-01&to=2026-10-18"

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/date/diff?from=2026-01-01&to=2026-10-18&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "days": 290,
  "weeks": 41.43,
  "years": 0,
  "months": 9,
  "remainingDays": 17,
  "weekdays": 207
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is date_diff, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

Questions

What input does it take?

Two dates or ISO timestamps, from and to.

How do I pay?

Each successful call costs $0.01; failed calls are not charged. The first 25 calls are free. Then pay with card credits (from $1; the key goes in an Authorization header or, for clients that can only fetch a URL, as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.

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