I'm a bit confused. You say you want to "rename all these rows", but looking at your screenshot it looks like you might mean you want to rename all the column headers. (?) If that's not the case, then list a few of the changes you want to make, like:
31/13/2013 to ???
BTW, with most dimensions you can 'rename rows' using Field Properties\Edit Aliases, but you can't do this with dates; instead you use the Date Format to change how they appear. You could of change a Date field to a String type, then use Edit Aliases, but then you lose the the Date-ness of the field.
Any of this help?
How do i rename column headers?
I know its a novice question but I am a novice user of this software.
When you 'rename' the field it will automatically change the header. Alias lets you rename the individual rows (except for dates as mentioned above).