add_years

Creates a copy of this and adds the specified number of years to the copy.

Add negative values to subtract years.

As with add_months, if the resulting date would be 29th February on a non-leap year, the day will be clamped to 28th February.

Parameters:

this	a DateTime
years	the number of years

Returns:

the newly created DateTime which should be freed with g_date_time_unref , or null