Today the world is celebrating the 

International Day of the Book

Although 23 April is often stated as the anniversary of the deaths of both Shakespeare and Cervantes, this is not strictly correct. Cervantes died on 23 April according the Gregorian calendar; however, at this time England still used the Julian calendar. Whilst Shakespeare died on 23 April by the Julian calendar in use in his own country at the time, actually he died ten days afterCervantes, because of the discrepancy between the two date systems. The apparent correspondence of the two dates was a fortunate coincidence for UNESCO.