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Calendar Systems – Leap Year Checker
x402
Calendar Systems – Leap Year Checker is a paid API for AI agents from calendar-systems.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Determines whether a given year is a leap year in the Gregorian, Julian, Hebrew, Islamic (tabular), or Persian calendar, and returns the applicable rule plus adjacent leap years.
Price / call$0.02
Success—
StatusUnknown
How this service works
Is a year a leap year in the Gregorian, Julian, Hebrew, Islamic (tabular) or Persian calendar? Rule and nearby leap years.
Output
Returns a boolean leapYear verdict, the calendar-specific rule as a string, a plain-language summary, the number of days in the year, the previous and next leap years, the leap cycle name, and optional disclaimer or degraded-mode flags.
Example use cases
Historical date accuracy check
“Was 1700 a leap year in the Gregorian calendar versus the Julian calendar? I'm trying to figure out if a historical document date would shift between Old Style and New Style.”
Hebrew calendar leap year lookup
“Is Hebrew year 5784 a leap year? I need to know the rule used and what the next and previous leap years are in the Hebrew calendar.”
Persian calendar leap year verification
“Is the Persian year 1403 a leap year? Tell me the leap rule and the surrounding leap years in the Persian Solar Hijri calendar.”
Technical details
Endpoint
GEThttps://calendar-systems.x402tookit.com/leap-year?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need calendar-system-specific leap year logic beyond just the Gregorian calendar — particularly for historical dates under the Julian calendar, Jewish/Hebrew calendar computations, Islamic tabular calendar scheduling, or Persian Solar Hijri date arithmetic. It also provides adjacent leap years and rule explanations, making it ideal for educational or historical research contexts rather than a simple yes/no check.
Side effects
- Missing required 'year' parameter returns an error
- Invalid calendar enum value (not one of gregorian/julian/hebrew/islamic/persian) returns a validation error
- Extremely large or small year values may return degraded results or null fields
- Non-integer year values will fail schema validation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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