like i ask above, i want to set Special Price for product from date to date programmatically by code but don't know how. i can set in admin use

[![enter image description here][1]][1]

then [![enter image description here][2]][2]

but i want use code to set programmatically. If anyone know, please advance. thanks [1]: https://i.sstatic.net/gbajF.png [2]: https://i.sstatic.net/avvWk.png