Bug with time (S.T.A.L.K.E.R.: Shadow of Chernobyl)

guys go through the game in the PDA shows 05.05.2012 time but when you take a document in the agricultural industry okazyvaetsya that experimentation took place from 25.05.2012. so it sho Nada for no purpose to climb up to 25.05 30.05 or Shoto I don't get it!