I wonder what *exactly* Idsinga said to KD, ie did he say 'the 13th', or did he say 'Wednesday night'? If 'Wednesday night', then to me, that could be into the early hours of Thursday the 14th. When I talk about the night, it always includes the hours after midnight, including the wee hours of the next day... UNLESS I'm being totally careful about specifics, then I would say 'early hours of Thursday'. Because I myself refer to the night that way, I assume most others do as well. If Idsinga had said to KD, 'they died Wed night', could KD have taken that literally and then made it more specific than it actually was, by saying 'he said they died on the 13th'? ETA: And from there, KD could go even further to say it was therefore between 9pm and midnight, since it's the 14th after midnight and Idsinga said the 13th (when in fact Idsinga had actually only said 'wed night').
eg. One of my best friends died suddenly and unexpectedly, and the offspring called me next day, and said 'dad died last night'. To this day, I still don't know for sure the date of my friend's death (there was no obit, no funeral, no nothing ). To me, he could've died at 12:30am, or 2am, or 11pm or 10pm or 7pm.. I don't have those specifics. Perhaps neither does KD.
eg. One of my best friends died suddenly and unexpectedly, and the offspring called me next day, and said 'dad died last night'. To this day, I still don't know for sure the date of my friend's death (there was no obit, no funeral, no nothing ). To me, he could've died at 12:30am, or 2am, or 11pm or 10pm or 7pm.. I don't have those specifics. Perhaps neither does KD.