Corrected entry: It is made very clear several times throughout the movie that the team of students is going back to the year 1357. However, when Stern is showing the students the result of his discovery on the computer screen, concerning how old the ink on the document with the Professor's handwriting is, the date is 1361.
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Correction: Real dating methods used for checking ancient ink's age are only exact to within 20 years, 15 years at best. They don't find out the exact date until they visit the time travel corporation later. A 4 year discrepancy is certainly acceptable.
Grumpy Scot