deanoemcke/jquery-week-calendar — comment on commit 92ef3861549bbf61c80443b82c51f44349b683b7
File:  line 0
By deanoemcke:

just realised this change causes exactly the same problem in ie8. the corrected fix is to just swap the order of the 2 date parsing functions. seems to work ok across all browsers now.
return new Date(d) || Date.parse(d);