1779 was one day ahead of us in the week, for example if today is a Sunday then for them it was a Monday.
After the entrance of Spain into the American War of Independence (a de facto alliance, though not official), not much happened for the next month in terms of European politics. In America there continued to be battles, but really until the siege of Grenada by the French very little of it would have any impact at all on the life of those back in France.
For anyone reading and interested, like me, in what happened on any given day in history I refer you to the History Channel's website, which can be found by clicking the title at the top of this post.
The painting above is The Love Letter by Fragonard, who remains one of my favorite artists.