QGIS/resources/function_help/json/to_datetime

{
  "name": "to_datetime",
  "type": "function",
  "groups": ["Conversions", "Date and Time"],
  "description": "Converts a string into a datetime 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>, <a href='https://doc.qt.io/qt-5/qtime.html#fromString-1'>QTime::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 datetime value"},
   {"arg":"format","optional":true,"description":"format used to convert the string into a datetime"},
   {"arg":"language","optional":true,"description":"language (lowercase, two- or three-letter, ISO 639 language code) used to convert the string into a datetime. By default the current QGIS user locale is used."}
  ],
  "examples": [
   { "expression":"to_datetime('2012-05-04 12:50:00')", "returns":"2012-05-04T12:50:00"},
   { "expression":"to_datetime('June 29, 2019 @ 12:34','MMMM d, yyyy @ HH:mm')", "returns":"2019-06-29T12:34, if the current locale uses the name 'June' for the sixth month, otherwise an error occurs"},
   { "expression":"to_datetime('29 juin, 2019 @ 12:34','d MMMM, yyyy @ HH:mm','fr')", "returns":"2019-06-29T12:34"}
  ]
}