Washington Irving, in Rip Van Winkle, provides many different hints as to provide Rip with clues to the fact that he is no longer in the same time period in which he fell asleep.
The first clue that time has passed is the fact that Rip's gun has rusted. While he believes that his gun was stolen, it has simply oxidized. Rip also finds his dog missing.
Next, as Rip enters the village, he notices that he does not recognize any of the villagers, nor do they seem to recognize him. Rip certainly begins to become concerned at this point.
When looking around the village, Rip begins to notice the changes in the architecture and the clothing of the villagers. The clothing and buildings have changed dramatically since his "nap."
Later, Rip comes upon his own home. It has fallen in ruins. Concerned greatly now, Rip goes to the village inn. Upon entering the inn, he not only continues to notice the strangers, but he also notices that the picture of King George III has been replaced with one of George Washington.
All of these things Rip notices are hints provided regarding the passage of time.