{
  "name": "year",
  "type": "function",
  "groups": ["Date and Time"],
  "description": "Extracts the year part from a date, or the number of years from an interval.",
  "variants": [
  { "variant": "Date variant",
      "variant_description": "Extracts the year part from a date or datetime.",
      "arguments": [ {"arg":"date","description":"a date or datetime value"}],
      "examples": [ { "expression":"year('2012-05-12')", "returns":"2012"}] },
      {
      "variant": "Interval variant",
      "variant_description": "Calculates the length in years of an interval.",
      "arguments": [ {"arg":"interval","description":"interval value to return number of years from"}],
      "examples": [ { "expression":"year(to_interval('3 years'))", "returns":"3"},
                    { "expression":"year(age('2012-01-01','2010-01-01'))", "returns":"1.9986"}]
  }]
}