Division 3.2.7.2 As from 1 January 2000 ; in the form of a group of four digits, the first two showing the week number and the second two showing the year in which the tyre was retreaded. The date code can cover a period of production from the week indicated by the week number up to and including the week number plus three. For example, the marking ‘2503’ could indicate a tyre which was retreaded in weeks 25, 26, 27 or 28 of the year 2003.F1