I don't know if this change occured in PD15 or not, but in PD17 there is the option to sort by Date Modified, which is the actual date the clip was shot (as determined by your camera's date/time setting). In the screenshot below, all clips were shot in Aug 2018:
In PD17, it appears that the Date Created is
not when the clip was imported into Windows, but actually when it was added to PD's media library. If that's the case, you could set the file order in the Import Media Files window the way you want it and PD will retain that time order as the files are sequentially added.
I tested a subset of the same set of clips shown above in PD14, and the Date field is the actual recording date and time, which was the morning of Aug 3, 2018:
I'm not sure why PD15 would be different, but stranger things have happened.
YouTube/optodata
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