The dates for requesting recounts:
Wisconsin: Friday, Nov. 25th (Trump’s winning margin stands at 0.7%.)
Pennsylvania: Monday, Nov. 28th (Trump’s winning margin stands at 1.2%)
Michigan: Wednesday, Nov 30th (Trump lead is currently just 0.3% - Michigan currently has not declared a winner)
The Electoral College:
On December 19th, the Electors meet in their states and vote for President and Vice President on separate ballots.
More details about the Electoral College