See the discussion in Stop auto correction and auto formatting. Danny Khen - Excel Program Manager - says "This feature is now in our list of desired features." so maybe in Excel 2015??
here's an extract (my emphasis):
SandraM12's post on February 15, 2013
Excel likes to correct text that I type and to turn the text into dates, e.g. "2/2013" is turned into "Feb 2013". Unfortunately I'm not entering a date but something that could be viewed as a date, but it is in fact something else. So I want to turn off this
auto formatting.
Is it possible to turn this feature off on my computer?
Danny Khen replied on February 16, 2013
Microsoft
Reply In reply to SandraM12's post on February 15, 2013
Thank you for your feedback. The short answer is - no at this time. The feature is designed with the assumption in most cases, when people type date-like strings (or time-like, or number-like), they would want them to be typed as that data type. Auto-formatting
does more than formatting - it determines the type of the data, and that in turns typically gives better experience and functionality around the inpout that you typed (e.g. you can do arithmetic on numbers; you can sort dates by their calendar order; you cannot
do all of this on text). For the minority of cases, like yours, where the date-like input is actually not dates, there are the two options that you mention. Formatting cells as text can be done in bulk (entire ranges, columns, rows or sheets), so should not
be very time consuming, although of course it does take an extra step.
Although this feature is not currently available in Excel, Microsoft is committed to continuously improving your experience with our products.
This feature is now in our list of desired features.
Danny Khen - Excel Program Manager