End of Restrictions
The restrictions of The Nine Days conclude at midday of the Tenth of Av, the day after Tisha B'Av. The Sages enforced this extension of the mourning period to reflect the fact that while the Temple was set on fire during the afternoon of Tisha B'Av, it continued to burn through the Tenth of Av. All the prohibitions associated with The Nine Days are still in effect until midday, although one who attends a seudat mitzvah at this time may consume meat and wine.
When Tisha B'Av falls on a Shabbat, the fast day is postponed until Sunday (the Tenth of Av). In this case, most restrictions end at nightfall after the fast. Except for the drinking of Havdalah wine, consumption of meat and wine are delayed until the following morning. Some opinions say that one should not listen to music until the next morning.
Read more about this topic: The Nine Days