On 26/05/2013,
you requested for the version in force on 26/05/2013
incorporating all amendments published on or before 26/05/2013.
The closest version currently available is that of 01/01/2013.
49. Wherever the word “year” or “month” is used, it is to be understood that the year or the month is to be reckoned according to the Gregorian calendar.