Date Arithmetic (add duration)

Add years/months/weeks/days/hours to an ISO date; month math clamps to end-of-month.

Free tier eligible — 500 calls/month with a free key from /pricing; x402 pay-per-call above quota.

Parameters

Parameter	Type	Required	Description
`date`	string	required	ISO date YYYY-MM-DD or full datetime
`years`	integer	optional	Years to add (may be negative)
`months`	integer	optional	Months to add (may be negative)
`weeks`	integer	optional	Weeks to add (may be negative)
`days`	integer	optional	Days to add (may be negative)
`hours`	integer	optional	Hours to add (may be negative)
`minutes`	integer	optional	Minutes to add (may be negative)
`seconds`	integer	optional	Seconds to add (may be negative)

Call it over MCP (JSON-RPC 2.0)

curl -s https://wingmanprotocol.com/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": {"name": "date_add", "arguments": {"date": "2026-07-06"}}}'

Or plain HTTP

curl -s https://wingmanprotocol.com/tools/date_add \
  -H 'Content-Type: application/json' \
  -d '{"date": "2026-07-06"}'

Try it live

Edit the JSON and run it — this POSTs to https://wingmanprotocol.com/tools/date_add from your browser.

This tool is x402-metered — agents pay per call with USDC on Base. The 402 response below is the standard x402 payment-requirements envelope: sign the EIP-3009 authorization and retry with the X-Payment header, or get a free key at /pricing (500 calls/month, no card, no crypto).