Week number and date facts: ISO week, weekday, day of year, quarter

$0.001 per call with a key ($0.01 paid per call from a wallet) · failed calls are never charged · no account needed: a card key or USDC

Weekday, ISO week number and week-year, day of the year, quarter, days in the month, leap year, Unix timestamp and whether it is a weekend, for any date. Use for calendar and reporting logic.

Run it free (3 free calls) Buy credits by card (from $1) Example result (JSON)

$0.001 per call with prepaid credits: $1 by card pays for 1,000 calls, with no account and no subscription.

Try it with your own inputs

Date or ISO timestamp (default today)

Uses one of your 3 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
datestringDate or ISO timestamp (default today)

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://glyphcall.com/date/info?date=2026-10-18"

Or one of your 3 free calls, no key:

curl "https://glyphcall.com/date/info?date=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

{
  "date": "2026-10-18",
  "weekday": "Sunday",
  "isoWeek": 42,
  "isoWeekYear": 2026,
  "dayOfYear": 291,
  "quarter": 4,
  "daysInMonth": 31,
  "leapYear": false,
  "weekend": true,
  "unix": 1792281600
}

From an AI agent (MCP)

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

https://glyphcall.com/mcp

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