Did Miscrosoft change how it dates files?

Greetings

I have a batch file using Robocopy which is only suppose to copy
those files which are "newer" (I.e., modified) than the ones on the
drive. Usually, there is no problem. But tonight, as I go to close
up operations for the evening, it is copying far more files than
before. all tagged "newer".
Was there something magical about the shift to Daylight Savings
time which makes a source drive file dated "Jan 2 2019 10:20 AM" to
now be "newer" than the target drive file dated "Jan 2 2019 10:20
AM"?
I haven't changed "CHAR Sets.wpd" since 1996!?

I do remember something like this happening when the batchfile
correctly copied files from a flashdrive to the XP laptop, and then I
was done with the letter writing, the batchfile copied _all_ the files
just copied (but not used) back from the hardrive to the flash drive.

You'll have a great deal of difficulty convincing me that the
folks at Microsott really have an idea what they are doing.


--
pyotr filipivich
The question was asked: "Is Hindsight overrated?"
In retrospect, it appears to be.