QGIS/resources/function_help/json/to_date

{
  "name": "to_date",
  "type": "function",
  "groups": ["Conversions", "Date and Time"],
  "description": "Converts a string into a date object. An optional format string can be provided to parse the string; see <a href='https://doc.qt.io/qt-5/qdate.html#fromString-2'>QDate::fromString</a> or the documentation of the format_date function for additional documentation on the format. By default the current QGIS user locale is used.",
  "arguments": [{
    "arg": "string",
    "description": "string representing a date value"
  }, {
    "arg": "format",
    "optional": true,
    "description": "format used to convert the string into a date"
  }, {
    "arg": "language",
    "optional": true,
    "description": "language (lowercase, two- or three-letter, ISO 639 language code) used to convert the string into a date. By default the current QGIS user locale is used."
  }],
  "examples": [{
    "expression": "to_date('2012-05-04')",
    "returns": "2012-05-04"
  }, {
    "expression": "to_date('June 29, 2019','MMMM d, yyyy')",
    "returns": "2019-06-29, if the current locale uses the name 'June' for the sixth month, otherwise an error occurs"
  }, {
    "expression": "to_date('29 juin, 2019','d MMMM, yyyy','fr')",
    "returns": "2019-06-29"
  }],
  "tags": ["provided", "additional", "user", "format_date", "parse", "qdate", "converts", "default", "current", "format", "object", "fromstring", "date", "optional", "documentation", "see"]
}