{
  "address": "e40c085c184861f24f9c6e0ad8a79172",
  "category": "other",
  "question": "Is 2000 a leap year?",
  "answer": "yes",
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  "madeAt": "2026-09-30T22:39:30.722Z",
  "validUntil": null,
  "validityClass": "forever",
  "sources": [
    {
      "label": "Calendars FAQ",
      "url": "https://aa.usno.navy.mil/faq/calendars"
    }
  ],
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    "kind": "url",
    "value": "https://aa.usno.navy.mil/faq/calendars",
    "retrieved_utc": "2026-09-30T19:41:35Z"
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  "method": {
    "name": "Is it a leap year?",
    "version": "1",
    "source_url_or_file": "methods/is-leap-year.cjs",
    "sha256_of_method_file": "bedbb6cd17134c76341c4dcbb83a8baaafbb9f2060109d14317f3fbfa8c471cb"
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  "method_deck": {
    "inputs": [
      {
        "name": "year",
        "type": "integer",
        "required": true,
        "description": "Proleptic Gregorian calendar year"
      }
    ],
    "outputs": [
      {
        "name": "is_leap",
        "type": "boolean",
        "description": "True if the year has a February 29"
      }
    ],
    "steps": [
      "A year is a leap year if it is divisible by 4.",
      "Exception: a year divisible by 100 is NOT a leap year.",
      "Exception to the exception: a year divisible by 400 IS a leap year.",
      "Apply the rules in that order (or equivalently: divisible by 4 and not by 100, OR divisible by 400)."
    ],
    "constants": [],
    "examples": [
      {
        "name": "worked example",
        "inputs": {
          "year": 2000
        },
        "expected": {
          "answer": "yes"
        },
        "check": "2000 is divisible by 400, so it is a leap year despite being a century year"
      },
      {
        "name": "test vector: century exception",
        "inputs": {
          "year": 1900
        },
        "expected": {
          "answer": "no"
        },
        "check": "1900 is divisible by 100 but not by 400, so it is not a leap year"
      },
      {
        "name": "test vector: ordinary leap year",
        "inputs": {
          "year": 2024
        },
        "expected": {
          "answer": "yes"
        },
        "check": "2024 is divisible by 4 and not by 100"
      }
    ],
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    "deck_category": "dates"
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          "value": "https://aa.usno.navy.mil/faq/calendars",
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        },
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        "supersedes": null,
        "added_utc": "2026-09-30T22:39:30.722Z",
        "added_by": "method:Is it a leap year?",
        "why": "the method that computed this answer",
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        "status_label": "pending",
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}