Have you tried the fixes that have been posted quite a few times in this topic, namely these:
1. Open up your clock down in the right hand corner.
2. Click 'Change date and time'
3. Click 'Change calendar settings'
4. Under the 'Date' tab, make sure your date formats are the same, ie. dd-MMM-yy
for short, dddd-MMMM-dd-yyyy for long. MAKE SURE THEY ARE SET TO UK DATES.