After Nathan convinces Emilie to give him and the town two weeks, there is a montage of scenes implying the passage of time. However, in the final scene after the montage ends when Nathan comes out of the house and they're all admiring the lights, it's the same day as the day he convinced her to stay for two weeks. Also during the montage you see the Christmas tree up without any decorations; however, previously, when Alexander Foster shows up at her door, the tree is there and fully decorated.