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WebberSites Date Arithmetic API
x402
WebberSites Date Arithmetic API is a paid API for AI agents from api.webbersites.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Performs exact calendar math: differences between dates (days/business days/weeks/hours), date addition/subtraction with business-day support, and date metadata lookup (weekday, ISO week, day-of-year, leap year, unix timestamp).
Price / call$0.001
Success—
StatusUnknown
How this service works
Exact date arithmetic — the calendar math LLMs guess at. ?from=&to= → days, business days, weeks, hours between; ?date=&add=30d|2w|3m|1y|10bd → the resulting date (bd = business days); ?date= alone → weekday, ISO week, day-of-year, leap year, unix. All UTC, Mon-Fri business days, real-calendar validation (Feb 30 is rejected).
Output
A JSON object containing one or more of: diff (days, business days, weeks, hours between two dates), result (the date after adding/subtracting a duration), or date metadata (weekday, ISO week number, day-of-year, leap year boolean, unix timestamp). Invalid inputs like Feb 30 are rejected with a validation error.
Example use cases
Example prompt
“How many business days are there between March 15 and April 30, 2025, and what date lands exactly 10 business days after April 30?”
Technical details
Endpoint
GEThttps://api.webbersites.com/api/calc/datesWhen to prefer
Use this endpoint whenever precise calendar math is required — especially when business-day counting, month/year offsets, or real-calendar validation (rejecting Feb 30) matter. Prefer this over asking an LLM to compute dates directly, since LLMs are prone to off-by-one errors and business-day miscounts. Ideal for scheduling, deadline calculation, SLA tracking, or any workflow requiring deterministic date results.
Side effects
- Invalid date string (e.g. Feb 30) — rejected with a validation error
- Missing required query parameters for the chosen operation mode
- Malformed duration expression in 'add' parameter (e.g. unsupported unit)
- Network or upstream server error returning a non-200 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"to": {
"date": "2026-12-25",
"weekday": "Friday"
},
"diff": {
"days": 169,
"weeks": 24.14,
"business_days": 121
},
"from": {
"date": "2026-07-09",
"weekday": "Thursday"
}
}
}Tags
x402
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