QGIS/resources/function_help/json/to_datetime

{
  "name": "to_datetime",
  "type": "function",
  "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/qdatetime.html#fromString-1'>QDateTime::fromString</a> for additional documentation on the format.",
  "arguments": [
   {"arg":"string","description":"string representing a datetime value"},
   {"arg":"format","optional":true,"description":"format used to convert the string into a date"}
  ],
  "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"}
  ]
}