Thanks for spotting this and reporting it.
Yes, the dates are given in different formats for the two methods (wish they would standardise!), and Spine processes accordingly. I can't believe they have changed the format yet again! (Meaning: it wouldn't surprise me in the least.)
I will check this out. If the format has indeed changed, I'll try to make the parsing a bit more robust, in case they feel like changing it back again.
PS: My internet connection was down this morning, otherwise I'd probably have picked this up earlier.