{
  "name": "day",
  "type": "function",
  "groups": ["Date and Time"],
  "description": "Extracts the day from a date, or the number of days from an interval.",
  "variants": [{
    "variant": "Date variant",
    "variant_description": "Extracts the day from a date or datetime.",
    "arguments": [{
      "arg": "date",
      "description": "a date or datetime value"
    }],
    "examples": [{
      "expression": "day('2012-05-12')",
      "returns": "12"
    }]
  }, {
    "variant": "Interval variant",
    "variant_description": "Calculates the length in days of an interval.",
    "arguments": [{
      "arg": "interval",
      "description": "interval value to return number of days from"
    }],
    "examples": [{
      "expression": "day(to_interval('3 days'))",
      "returns": "3"
    }, {
      "expression": "day(to_interval('3 weeks 2 days'))",
      "returns": "23"
    }, {
      "expression": "day(age('2012-01-01','2010-01-01'))",
      "returns": "730"
    }]
  }],
  "tags": ["date", "extracts", "interval", "days", "number", "day"]
}