_The --set-utc (-Z) option causes patch to set a patched file’s modification
and access times to the timestamps given in context diff headers._
=>
behavior of diff file without date header
_patch normally refrains from setting a file’s timestamps if the file’s
original last-modified timestamp does not match the time given in the diff
header, of if the file’s contents do not exactly match the patch._
=>
behavior of diff file with date header
See
https://www.gnu.org/software/diffutils/manual/html_node/Patching-Timestamps.html#Patching-Timestamps
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