That's odd, no idea where that date is coming from :\
I copy pasted the patch directly from github, so it's a github strangeness:

See 
https://github.com/xbmc/xbmc/commit/c90da1375e57c7b1db0f39353830d08adc9dd6be
vs 
https://github.com/xbmc/xbmc/commit/c90da1375e57c7b1db0f39353830d08adc9dd6be.patch


The commit was only made to xbmc master a few days ago, so it's not in any OpenElec XBMC tarballs yet.