iPhone screenshots have wrong date info on PC

I recently exported several screenshots from my iPhone SE onto my Windows 10 PC. I noticed some photos, but specially the screenshots, have a wrong value for the date taken and the date created.

The images on the phone have the correct date before exporting them. They are only incorrect after transferring to the computer.

There does not seem to be a constant factor by which the date is off. Sometimes, only the time is wrong and others both the date and the time are wrong.

For what is worth, the screenshots have a PNG extension while photos have a JPG extension and I have already check that the system clock of both my PC and my phone are set correctly.

Is there anyway to get these to offload with the correct times?

I'll start by saying that the file extension itself has nothing to do with the time metadata alterations for your photos.

Now to address the problem at hand: it depends on how you exported your photos. If you copied the files over to your PC using Windows Explorer (which I suspect you did) then Windows will not reliably preserve the original time/date metadata of your photos. As you mentioned yourself, Windows isn't even consistent in the fashion in which it alters the time metadata. If you're copying just one file, the metadata should be correct. Other times, if you're doing a bulk copy, not only will Windows sometimes change the time metadata for certain files, but it'll also change the filename for certain files. Why this happens, I don't know.

I haven't used iTunes in a while (I use iMazing instead to manage my iPhone – you should check it out if you're interested in an alternative to iTunes) but I do believe that if you import your photos and videos via iTunes, then all your files' metadata will be correctly preserved and handled.