QGIS/resources/function_help/json/from_epoch

{
  "name": "datetime_from_epoch",
  "type": "function",
  "description": "Returns a datetime whose date and time are the number of milliseconds, msecs, that have passed since 1970-01-01T00:00:00.000, Coordinated Universal Time (Qt.UTC), and converted to Qt.LocalTime.",
  "arguments": [ {"arg":"int","description":"number (milliseconds)"} ],
  "examples": [ { "expression":"datetime_from_epoch(1483225200000)", "returns":"2017-01-01T00:00:00"} ]
}