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Add Days to Date Calculator
x402
Add Days to Date Calculator is a paid API for AI agents from x402.forgemesh.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Adds or subtracts a number of days from a given date and returns the resulting calendar date with its weekday, or computes the number of days between two dates.
Price / call$0.001
Success—
StatusUnknown
How this service works
Adds or subtracts a number of days from any date and returns the resulting calendar date plus its weekday, exact date arithmetic instead of the off-by-one errors that show up when a model counts days in its head. For deadline calculations, reminder scheduling, and contract term tracking.
Output
Returns the resulting calendar date after adding or subtracting the specified number of days from the start date, along with the weekday name of the result. If an end date is provided instead of add_days, returns the number of days between the two dates.
Example use cases
Example prompt
“What date is exactly 90 days after March 15, 2025, and what day of the week does that fall on?”
Technical details
Endpoint
POSThttps://x402.forgemesh.io/add-days-to-dateWhen to prefer
Use this endpoint when you need precise calendar date arithmetic — adding or subtracting a specific number of days from a date — and need the exact resulting date and weekday without risk of off-by-one errors that LLMs are prone to when counting days mentally. Ideal for deadline calculations, trial period end dates, contract term tracking, and reminder scheduling.
Side effects
- Invalid ISO date format returns an error or unexpected result
- Missing both add_days and end date may return ambiguous or default output
- Extremely large day offsets may exceed supported date ranges
- Non-integer or malformed add_days string may cause parsing errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| end | string | ISO date — if set, returns days between |
| start | string | ISO date (default now) |
| add_days | string | days to add to start |
Output
Schema · Response
{
"type": "json",
"example": {
"calendar_days": 17,
"business_days_weekdays_only": 13
}
}Tags
x402
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