Julius Caesar was originally published in the First Folio of 1623, but a performance was mentioned by Thomas Platter the Younger in his diary in September 1599. The play is not mentioned in the list of Shakespeare's plays published by Francis Meres in 1598. Based on these two points, as well as a number of contemporary allusions, and the belief that the play is similar to Hamlet in vocabulary, and to Henry V and As You Like It in metre, scholars have suggested 1599 as a probable date.
The text of Julius Caesar in the First Folio is the only authoritative text for the play. The Folio text is notable for its quality and consistency; scholars judge it to have been set into type from a theatrical prompt-book. The source used by Shakespeare was Sir Thomas North's translation of Plutarch's Life of Brutus and Life of Caesar
The play contains many anachronistic elements from the Elizabethan era. The characters mention objects such as hats and doublets (large, heavy jackets) – neither of which existed in ancient Rome. Caesar is mentioned to be wearing an Elizabethan doublet instead of a Roman toga. At one point a clock is heard to strike and Brutus notes it with "Count the clock".