FastX402 Date Arithmetic

x402

FastX402 Date Arithmetic is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-17).

Adds or subtracts years, months, weeks, days, hours, minutes, and seconds to a date using calendar-correct rules, returning the ISO result and its weekday.

Price / call$0.001

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StatusUnknown

How this service works

146 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.

Output

A JSON object containing the original date in ISO 8601 format, the computed result date in ISO 8601 format, and the English name of the weekday of the result (e.g. Thursday).

Example use cases

Contract expiry date calculation

“Our contract starts on January 31, 2025 — what is the exact expiry date 18 months later, and what day of the week is it?”

Scheduled reminder 90 days out

“I need to send a reminder exactly 90 days after March 15, 2025 — what date is that and what weekday?”

Payroll date after adding hours

“If I start a shift at 2026-03-29T22:00:00Z and it lasts 10 hours, what datetime does it end and what day of the week is that?”

Technical details

Endpoint

GEThttps://fastx402.tools/date-add?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need calendar-correct date arithmetic — especially for month-end edge cases like January 31 + 1 month correctly yielding February 28 or 29 — and also want the resulting weekday returned alongside the ISO date, all in a single cheap call.

Side effects

Missing required 'date' query parameter returns an error
Malformed date string (not ISO 8601) returns a parse error
No duration parameters provided results in the same date returned
Negative values larger than the date range may return invalid results

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "date": "2024-01-31T00:00:00.000Z",
    "result": "2024-02-29T00:00:00.000Z",
    "weekday": "Thursday"
  }
}

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