Is a Janabah ghusl on Thursday night or Friday dawn sufficient for the Friday ghusl?

The time for Ghusl on Friday is after the dawn breaks. Whoever performs Ghusl after dawn, intending both the Ghusl of Friday and Ghusl from Janabah, then one Ghusl suffices for both. However, performing Ghusl on Thursday night for Janabah does not suffice for the Ghusl of Friday. The Ghusl of Friday is a Sunnah and not obligatory.