All, I am using a Powerbook G4 with 10.4.9 and running Microsoft Excel 11.3.3. I have just opened a spreadsheet to find that all the dates now read 2010 instead of 2006 and they are 1 day out as well e.g. Tuesday 10th Oct 2006 now reads Monday 11th Oct 2010. Q1 Anyone else find issues with recent upgrades e.g. 10.4.9 or MS security upgrades Q2 Anyone know of a systematic way to sort these out? I have 200 different dates to correct! Thanks in advance. John EDIT - All dates had 1462 added to them? Now fixed but don't know of problem source. This was not confined to one spreadsheet.