QGIS/resources/function_help/json/to_interval

{
  "name": "to_interval",
  "type": "function",
  "groups": ["Conversions", "Date and Time"],
  "description": "Converts a string to an interval type. Can be used to take days, hours, month, etc of a date.",
  "arguments": [{
    "arg": "string",
    "description": "a string representing an interval. Allowable formats include {n} days {n} hours {n} months."
  }],
  "examples": [{
    "expression": "to_interval('1 day 2 hours')",
    "returns": "interval: 1.08333 days"
  }, {
    "expression": "to_interval( '0.5 hours' )",
    "returns": "interval: 30 minutes"
  }, {
    "expression": "to_datetime('2012-05-05 12:00:00') - to_interval('1 day 2 hours')",
    "returns": "2012-05-04T10:00:00"
  }],
  "tags": ["type", "month", "converts", "date", "interval", "take", "hours", "days"]
}