Creates a copy of datetime and adds the specified number of years to the copy. Add negative values to subtract years.
As with glib.date_time.DateTime.addMonths, if the resulting date would be 29th February on a non-leap year, the day will be clamped to 28th February.
the number of years
the newly created #GDateTime which should be freed with glib.date_time.DateTime.unref, or null
Creates a copy of datetime and adds the specified number of years to the copy. Add negative values to subtract years.
As with glib.date_time.DateTime.addMonths, if the resulting date would be 29th February on a non-leap year, the day will be clamped to 28th February.