calendar.json

{
  "months": [
    {
      "0": {
        "name": "January",
        "abbr": "Jan",
        "number": 1,
        "days": 31
      },
      "1": {
        "name": "Febuary",
        "abbr": "Feb",
        "number": 2,
        "days": 28
      }
    }
  ],
  "years": [
    {
      "2019": {
        "offset": 1,
        "leap": "no",
        "days": 365
      },
      "2020": {
        "offset": 1,
        "leap": "yes",
        "days": 365
      }
    }
  ]
}